22121022121 has 16 divisors (see below), whose sum is σ = 24385536576. Its totient is φ = 19899000000.

The previous prime is 22121022107. The next prime is 22121022139. The reversal of 22121022121 is 12122012122.

It is a happy number.

It is not a de Polignac number, because 22121022121 - 2¹⁵ = 22120989353 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22121022095 and 22121022104.

It is not an unprimeable number, because it can be changed into a prime (22121022101) 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, 2229271 + ... + 2239171.

It is an arithmetic number, because the mean of its divisors is an integer number (1524096036).

Almost surely, 2^22121022121 is an apocalyptic number.

It is an amenable number.

22121022121 is a deficient number, since it is larger than the sum of its proper divisors (2264514455).

22121022121 is a wasteful number, since it uses less digits than its factorization.

22121022121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12024.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 22121022121 its reverse (12122012122), we get a palindrome (34243034243).

Subtracting from 22121022121 its reverse (12122012122), we obtain a palindrome (9999009999).

The spelling of 22121022121 in words is "twenty-two billion, one hundred twenty-one million, twenty-two thousand, one hundred twenty-one".