general_fact: 16829 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 16829 is an uninteresting number.
trivia: 16829 is an uninteresting number.
historical_date: January 27th is the day in 447 that the Walls of Constantinople are severely damaged by an earthquake, destroying large parts of the wall, including 57 towers.