11 is the natural number that follows 10 and precedes 12. Written in English words as “Eleven”, it is the smallest number with a name consisting of three syllables. Mathematical Properties Numeral: 11 Spelling: Eleven Roman Numeral: XI (formed by X + I) Ordinal Form: 11th (eleventh) Place Value: Consists of 1 “ten” and 1 “one”. Quick Facts