22918121 has 2 divisors, whose sum is σ = 22918122. Its totient is φ = 22918120.

The previous prime is 22918117. The next prime is 22918151. The reversal of 22918121 is 12181922.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20830096 + 2088025 = 4564^2 + 1445^2 .

It is a cyclic number.

It is not a de Polignac number, because 22918121 - 2² = 22918117 is a prime.

It is not a weakly prime, because it can be changed into another prime (22918111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11459060 + 11459061.

It is an arithmetic number, because the mean of its divisors is an integer number (11459061).

Almost surely, 2^22918121 is an apocalyptic number.

It is an amenable number.

22918121 is a deficient number, since it is larger than the sum of its proper divisors (1).

22918121 is an equidigital number, since it uses as much as digits as its factorization.

22918121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 576, while the sum is 26.

The square root of 22918121 is about 4787.2874365344. The cubic root of 22918121 is about 284.0488286406.

The spelling of 22918121 in words is "twenty-two million, nine hundred eighteen thousand, one hundred twenty-one".