22222022121 has 24 divisors (see below), whose sum is σ = 34909861896. Its totient is φ = 13539686400.

The previous prime is 22222022111. The next prime is 22222022177. The reversal of 22222022121 is 12122022222.

22222022121 is a `hidden beast` number, since 222 + 220 + 221 + 2 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 3436304400 + 18785717721 = 58620^2 + 137061^2 .

It is not a de Polignac number, because 22222022121 - 2¹⁷ = 22221891049 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22222022094 and 22222022103.

It is not an unprimeable number, because it can be changed into a prime (22222022111) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 928440 + ... + 952073.

It is an arithmetic number, because the mean of its divisors is an integer number (1454577579).

Almost surely, 2^22222022121 is an apocalyptic number.

It is an amenable number.

22222022121 is a deficient number, since it is larger than the sum of its proper divisors (12687839775).

22222022121 is a wasteful number, since it uses less digits than its factorization.

22222022121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1880633 (or 1880630 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 22222022121 its reverse (12122022222), we get a palindrome (34344044343).

The spelling of 22222022121 in words is "twenty-two billion, two hundred twenty-two million, twenty-two thousand, one hundred twenty-one".