general_fact: 82821 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 82821 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
trivia: 82821 is an unremarkable number.
historical_date: October 3rd is the day in 1929 that the Kingdom of Serbs, Croats and Slovenes is renamed to Kingdom of Yugoslavia, "Land of the South Slavs".