general_fact: 21395 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 21395 is a boring number.
trivia: 21395 is an uninteresting number.
historical_date: July 29th is the day in 1907 that Sir Robert Baden Powell sets up the Brownsea Island Scout camp in Poole Harbour on the south coast of England.