22656121 has 4 divisors (see below), whose sum is σ = 23988852. Its totient is φ = 21323392.

The previous prime is 22656119. The next prime is 22656143. The reversal of 22656121 is 12165622.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9954025 + 12702096 = 3155^2 + 3564^2 .

It is a cyclic number.

It is not a de Polignac number, because 22656121 - 2¹ = 22656119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22656181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 666340 + ... + 666373.

It is an arithmetic number, because the mean of its divisors is an integer number (5997213).

Almost surely, 2^22656121 is an apocalyptic number.

It is an amenable number.

22656121 is a deficient number, since it is larger than the sum of its proper divisors (1332731).

22656121 is a wasteful number, since it uses less digits than its factorization.

22656121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1332730.

The product of its digits is 1440, while the sum is 25.

The square root of 22656121 is about 4759.8446403218. The cubic root of 22656121 is about 282.9622619458.

The spelling of 22656121 in words is "twenty-two million, six hundred fifty-six thousand, one hundred twenty-one".