general_fact: 21785 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 21785 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
trivia: 21785 is an uninteresting number.
historical_date: August 23rd is the day in 1650 that Colonel George Monck of the English Army forms Monck's Regiment of Foot, which will later become the Coldstream Guards.