general_fact: 86821 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 86821 is an unremarkable number.
trivia: 86821 is an unremarkable number.
historical_date: September 15th is the day in 1962 that the Soviet ship Poltava heads toward Cuba, one of the events that sets into motion the Cuban Missile Crisis.