general_fact: 21462 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 21462 is an uninteresting number.
trivia: 21462 is an unremarkable number.
historical_date: October 4th is the day in 1967 that Omar Ali Saifuddin III of Brunei abdicates in favour of his son, His Majesty Sultan Hassanal Bolkiah.