India's mathematical wizard, Shakuntala Devi, popularly called the "human computer", has reportedly died at a hospital in the southern city of Bengaluru at the age of 83.

"For the past one year, Devi was not keeping well, she had been falling ill now and then. On Sunday at around 8.15 a.m., she had a heart attack and breathed her last," D.C. Shivadev of the Shakuntala Devi Educational Foundation Public Trust was quoted by local media as saying.

Devi shot to fame for her ability to make complex mathematical calculations since her childhood though she had no formal education. She could aptly multiply two random 13-digit numbers in a few seconds and once calculated the 23rd root of a 201 digit number mentally in a minute.

"Her techniques to simplify math were not used by educational institutions. It is a pity that her techniques died with her," Shivadev said.