math_fact: 21393 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
trivia: 21393 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
historical_date: July 27th is the day in 1990 that the Supreme Soviet of the Belarusian Soviet Republic declares independence of Belarus from the Soviet Union.