general_fact: 21034 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 21034 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
trivia: 21034 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
historical_date: August 2nd is the day in 1873 that the Clay Street Hill Railroad begins operating the first cable car in San Francisco's famous cable car system.