All NFL teams wore #21 on their helmets in Week 13 of 2007, to honor Sean Taylor, the Redskins star who was killed. Some, but not all, NFL teams continued wearing the number for the rest of the season.
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There never was and probably never will be as they are the only NFL team without a logo.
As long as nobody else in the team is wearing it, any number is fine. You probably won't be that lucky since most teams go from 2 - 16 for field players.
number 25 for all three teams.
Colts and Saints.
Every league must have ten or over teams.