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Shakuntala Devi (4 November 1929 – 21 April 2013) was an Indian mental calculator, , and , popularly known as the "Human Computer". Her talent earned her a place in the 1982 edition of The Guinness Book of World Records. However, the certificate for the record was given posthumously on 30 July 2020, despite Devi achieving her world record on 18 June 1980 at Imperial College, London. Devi was a child, and she demonstrated her arithmetic abilities at the University of Mysore without any formal education.

Devi strove to simplify numerical calculations for students. She wrote several books in her later years, including novels as well as texts about mathematics, puzzles, and astrology. She wrote the book The World of Homosexuals, which is considered the first study of homosexuality in India.: "The first academic book on Indian homosexuals appeared in 1977 ( The World of Homosexuals) written by Shakuntala Devi, the mathematics wiz kid who was internationally known as the human computer. This book saw homosexuality in a positive light and reviewed the socio-cultural and legal situation of homosexuality in India and contrasted that with the gay liberation movement then taking place in the USA." She saw homosexuality in a positive light and is considered a pioneer in the field.


Early life
Shakuntala Devi was born on 4 November 1929 at , . to a family. Her father, C V Sundararaja Rao, worked as a trapeze artist, lion tamer, tightrope walker and magician in a circus. He discovered his daughter's ability to memorise numbers while teaching her a card trick when she was about three years old. Her father left the circus and took her on road shows that displayed her ability at calculation. She did this without any formal education. At the age of six she demonstrated her arithmetic abilities at the University of Mysore.

In 1944 at a young age of 15 yrs, Devi moved to , .


Mental calculator
Devi travelled to several countries around the world, demonstrating her arithmetic talents. She was on a tour of Europe throughout 1950 and was in New York City in 1976. In 1988, she travelled to the US to have her abilities studied by , a professor of educational psychology at the University of California, Berkeley. Jensen tested her performance at several tasks, including calculating large numbers. Examples of the problems presented to Devi included calculating the of 61,629,875 and the of 170,859,375. Jensen reported that Devi provided the solution to the above-mentioned problems (395 and 15, respectively) before Jensen could copy them down in his notebook. Jensen published his findings in the academic journal Intelligence in 1990.Note that there are easy tricks for getting odd-numbered roots when the root is an integer. See "Tricks of Lightning Calculators", in Mathematical Carnival, by Martin Gardner, Knoff, 1975 and other sources.

In 1977, at Southern Methodist University, she computed the 23rd root of a 201-digit number in 50 seconds. Her answer, 546,372,891, was confirmed by calculations done at the US Bureau of Standards using the UNIVAC 1101 computer, for which a special program had to be written to perform such a large calculation.

(1983). 9780231056403, Columbia University Press.
It took the UNIVAC computer 62 seconds to produce the correct answer.

On 18 June 1980, she demonstrated the multiplication of two 13-digit numbers – 7,686,369,774,870 × 2,465,099,745,779. The Department of Computing at Imperial College London randomly picked these numbers. She correctly answered 18,947,668,177,995,426,462,773,730 in 28 seconds. This event was recorded in the 1982 Guinness Book of World Records. Writer Steven Smith commented, "the result is so far superior to anything previously reported that it can only be described as unbelievable."

Shakuntala Devi explained many of the methods she used to do mental calculations in her 1977 book Figuring: The Joy of Numbers.

(2025). 9788122200386, Orient Paperbacks. .


Book on homosexuality
In 1977, she wrote The World of Homosexuals, the first published academic study of homosexuality in India,
(1977). 9780706904789, Vikas Publishing House. .
for which she was criticised. In the documentary For Straights Only, she said that her interest in the topic was because of her marriage to a homosexual man and her desire to look at homosexuality more closely to understand it.

The book, considered "pioneering",

(2025). 9788184759693, Penguin UK. .
features interviews with two young Indian , a male couple in Canada seeking legal marriage, a temple priest who explains his views on homosexuality, and a review of the existing literature on homosexuality. It ends with a call for decriminalisation of homosexuality, and "full and complete acceptance—not tolerance and sympathy". The book, however, went mostly unnoticed at that time.


Personal life
Devi returned to India in the mid-1960s, and she married Paritosh Banerji, an officer of the Indian Administrative Service from . They divorced in 1979, after her husband's homosexuality was allegedly revealed. Their daughter Anupama Banerji claimed that Devi lied about her husband being gay to promote her book on homosexuals because her credibility on the subject matter was questioned.

In 1980, she contested the elections as an independent candidate for Mumbai South and for Medak in (now in ). In Medak she stood against the former Prime Minister , saying she wanted to "defend the people of Medak from being fooled by Mrs. Gandhi"; she came ninth, with 6,514 votes (1.47% of the votes). Devi returned to in the early 1980s.

In addition to her work as a mental calculator, Devi was a notable and an author of several books, including cookbooks and novels. She started with writing short stories and murder mysteries, and had a keen interest in music.


Death and legacy
In April 2013, Devi was admitted to a hospital in with severe respiratory problems. Over the following two weeks, she had heart and kidney complications. She died in the hospital on 21 April 2013. She was 83 years old. Her daughter Anupama Banerji is married to Ajay Abhaya Kumar, with whom she has two daughters, and lives in .

On 4 November 2013, Devi was honoured with a on what would have been her 84th birthday.

A film on her life titled Shakuntala Devi was announced in May 2019. The film stars in the lead title role and features , , and in the supporting roles. Produced by Sony Pictures Networks Productions, the film streamed worldwide on Amazon Prime Video on 31 July 2020.


Selected works


External links

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