11 is the first number which cannot be counted with a human's ten fingers, using each finger as a tally mark. In English, it is the smallest positive integer requiring three syllables and the largest prime number with a single-morpheme name. Its etymology originates from a Germanic compound ainlif meaning "one left".
11 is also equal to \(n(2)\) in the block subsequence theorem.
In googology Edit
In Greek-based number naming systems, 11 is associated with prefix "endeka-", and with prefix "undeci-" in Latin systems.