22557121 has 2 divisors, whose sum is σ = 22557122. Its totient is φ = 22557120.

The previous prime is 22557071. The next prime is 22557131. The reversal of 22557121 is 12175522.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18395521 + 4161600 = 4289^2 + 2040^2 .

It is a cyclic number.

It is not a de Polignac number, because 22557121 - 2²³ = 14168513 is a prime.

It is not a weakly prime, because it can be changed into another prime (22557131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11278560 + 11278561.

It is an arithmetic number, because the mean of its divisors is an integer number (11278561).

Almost surely, 2^22557121 is an apocalyptic number.

It is an amenable number.

22557121 is a deficient number, since it is larger than the sum of its proper divisors (1).

22557121 is an equidigital number, since it uses as much as digits as its factorization.

22557121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1400, while the sum is 25.

The square root of 22557121 is about 4749.4337557229. The cubic root of 22557121 is about 282.5495086436.

It can be divided in two parts, 225 and 57121, that multiplied together give a square (12852225 = 3585²).

The spelling of 22557121 in words is "twenty-two million, five hundred fifty-seven thousand, one hundred twenty-one".