general_fact: 17584 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 17584 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
trivia: 17584 is an unremarkable number.
historical_date: February 21st is the day in 1543 that Battle of Wayna Daga – A combined army of Ethiopian and Portuguese troops defeats a Muslim army led by Ahmed Gragn.