general_fact: 81122 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 81122 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
trivia: 81122 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
historical_date: February 7th is the day in 1819 that Sir Thomas Stamford Raffles leaves Singapore after just taking it over, leaving it in the hands of William Farquhar.