22111112121 has 16 divisors (see below), whose sum is σ = 33695779200. Its totient is φ = 12633925248.

The previous prime is 22111112119. The next prime is 22111112137. The reversal of 22111112121 is 12121111122.

It is a happy number.

It is not a de Polignac number, because 22111112121 - 2¹ = 22111112119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22111112121.

It is not an unprimeable number, because it can be changed into a prime (22111112161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 294525 + ... + 361893.

It is an arithmetic number, because the mean of its divisors is an integer number (2105986200).

Almost surely, 2^22111112121 is an apocalyptic number.

22111112121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

22111112121 is a deficient number, since it is larger than the sum of its proper divisors (11584667079).

22111112121 is a wasteful number, since it uses less digits than its factorization.

22111112121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83008.

The product of its digits is 16, while the sum is 15.

Adding to 22111112121 its reverse (12121111122), we get a palindrome (34232223243).

Subtracting from 22111112121 its reverse (12121111122), we obtain a palindrome (9990000999).

The spelling of 22111112121 in words is "twenty-two billion, one hundred eleven million, one hundred twelve thousand, one hundred twenty-one".