general_fact: 4281 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 4281 is an uninteresting number.
trivia: 4281 is an uninteresting number.
historical_date: September 20th is the day in 1973 that Billie Jean King beats Bobby Riggs in The Battle of the Sexes tennis match at the Houston Astrodome in Houston, Texas.