general_fact: 2401 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 2401 is the 4^{th} power of the sum of its digits.
trivia: 2401 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
historical_date: July 28th is the day in 2005 that the Provisional Irish Republican Army calls an end to its thirty year long armed campaign in Northern Ireland.