general_fact: 17621 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 17621 is an unremarkable number.
trivia: 17621 is a boring number.
historical_date: March 29th is the day in 1632 that Treaty of Saint-Germain is signed returning Quebec to French control after the English had seized it in 1629.