Fatto generale: 4099 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 4099 is a boring number.
Trivia: 4099 is an uninteresting number.
Data storica: March 22nd is the day in 1920 that Azeri and Turkish army soldiers with participation of Kurdish gangs attacked the Armenian inhabitants of Shushi (Nagorno Karabakh).