Fatto matematico: 2113 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 2113 is an unremarkable number.
Data storica: October 13th is the day in 1845 that a majority of voters in the Republic of Texas approve a proposed constitution, that if accepted by the U.S. Congress, will make Texas a U.S. state.