math_fact: 84170 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
trivia: 84170 is an unremarkable number.
historical_date: June 13th is the day in 2005 that a jury in Santa Maria, California acquits pop singer Michael Jackson of molesting 13-year-old Gavin Arvizo at his Neverland Ranch.