22222211121 has 48 divisors (see below), whose sum is σ = 36922429440. Its totient is φ = 12737489760.

The previous prime is 22222211117. The next prime is 22222211129. The reversal of 22222211121 is 12111222222.

It is a happy number.

It is not a de Polignac number, because 22222211121 - 2² = 22222211117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22222211094 and 22222211103.

It is not an unprimeable number, because it can be changed into a prime (22222211129) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1132036 + ... + 1151498.

It is an arithmetic number, because the mean of its divisors is an integer number (769217280).

Almost surely, 2^22222211121 is an apocalyptic number.

It is an amenable number.

22222211121 is a deficient number, since it is larger than the sum of its proper divisors (14700218319).

22222211121 is a wasteful number, since it uses less digits than its factorization.

22222211121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20106 (or 20103 counting only the distinct ones).

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

Adding to 22222211121 its reverse (12111222222), we get a palindrome (34333433343).

The spelling of 22222211121 in words is "twenty-two billion, two hundred twenty-two million, two hundred eleven thousand, one hundred twenty-one".