22112222121 has 12 divisors (see below), whose sum is σ = 34843501680. Its totient is φ = 13401346680.

The previous prime is 22112222087. The next prime is 22112222123. The reversal of 22112222121 is 12122221122.

It is a happy number.

It is not a de Polignac number, because 22112222121 - 2¹⁵ = 22112189353 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22112222094 and 22112222103.

It is not an unprimeable number, because it can be changed into a prime (22112222123) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 111677791 + ... + 111677988.

It is an arithmetic number, because the mean of its divisors is an integer number (2903625140).

Almost surely, 2^22112222121 is an apocalyptic number.

It is an amenable number.

22112222121 is a deficient number, since it is larger than the sum of its proper divisors (12731279559).

22112222121 is a wasteful number, since it uses less digits than its factorization.

22112222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223355796 (or 223355793 counting only the distinct ones).

The product of its digits is 128, while the sum is 18.

Adding to 22112222121 its reverse (12122221122), we get a palindrome (34234443243).

Subtracting from 22112222121 its reverse (12122221122), we obtain a palindrome (9990000999).

The spelling of 22112222121 in words is "twenty-two billion, one hundred twelve million, two hundred twenty-two thousand, one hundred twenty-one".