21222110222111 has 4 divisors (see below), whose sum is σ = 21490744528800. Its totient is φ = 20953475915424.

The previous prime is 21222110222099. The next prime is 21222110222113. The reversal of 21222110222111 is 11122201122212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21222110222111 - 2²² = 21222106027807 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222110222113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134317153226 + ... + 134317153383.

It is an arithmetic number, because the mean of its divisors is an integer number (5372686132200).

Almost surely, 2^{21222110222111} is an apocalyptic number.

21222110222111 is a deficient number, since it is larger than the sum of its proper divisors (268634306689).

21222110222111 is an equidigital number, since it uses as much as digits as its factorization.

21222110222111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268634306688.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 21222110222111 its reverse (11122201122212), we get a palindrome (32344311344323).

The spelling of 21222110222111 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred ten million, two hundred twenty-two thousand, one hundred eleven".