Fatto generale: 16819 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 16819 is an uninteresting number.
Trivia: 16819 is a boring number.
Data storica: January 17th is the day in 1903 that El Yunque National Forest in Puerto Rico becomes part of the United States National Forest System as the Luquillo Forest Reserve.