general_fact: 21053 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 21053 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
trivia: 21053 is a boring number.
historical_date: August 21st is the day in 2001 that the Red Cross announces that a famine is striking Tajikistan, and calls for international financial aid for Tajikistan and Uzbekistan.