22652721 has 48 divisors (see below), whose sum is σ = 42666624. Its totient is φ = 11238912.

The previous prime is 22652719. The next prime is 22652743. The reversal of 22652721 is 12725622.

22652721 is a `hidden beast` number, since 2 + 2 + 652 + 7 + 2 + 1 = 666.

It is not a de Polignac number, because 22652721 - 2¹ = 22652719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22652711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 13110 + ... + 14736.

It is an arithmetic number, because the mean of its divisors is an integer number (888888).

Almost surely, 2^22652721 is an apocalyptic number.

22652721 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

22652721 is a deficient number, since it is larger than the sum of its proper divisors (20013903).

22652721 is a wasteful number, since it uses less digits than its factorization.

22652721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1670 (or 1667 counting only the distinct ones).

The product of its digits is 3360, while the sum is 27.

The square root of 22652721 is about 4759.4874724071. The cubic root of 22652721 is about 282.9481065391.

The spelling of 22652721 in words is "twenty-two million, six hundred fifty-two thousand, seven hundred twenty-one".