general_fact: 20521 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 20521 is an uninteresting number.
trivia: 20521 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
historical_date: March 7th is the day in 1799 that Napoleon Bonaparte captures Jaffa in Palestine and his troops proceed to kill more than 2,000 Albanian captives.