general_fact: 87100 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 87100 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
trivia: 87100 is an uninteresting number.
historical_date: June 21st is the day in 1940 that the first successful west-to-east navigation of Northwest Passage begins at Vancouver, British Columbia, Canada.