general_fact: 13021 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 13021 is an uninteresting number.
trivia: 13021 is an uninteresting number.
historical_date: August 25th is the day in 1894 that Kitasato Shibasaburō discovers the infectious agent of the bubonic plague and publishes his findings in The Lancet.