general_fact: 21922 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 21922 is an uninteresting number.
trivia: 21922 is an unremarkable number.
historical_date: January 7th is the day in 1919 that Montenegrin guerrilla fighters rebel against the planned annexation of Montenegro by Serbia, but fail.