22624721 has 12 divisors (see below), whose sum is σ = 26640432. Its totient is φ = 19155528.

The previous prime is 22624703. The next prime is 22624753. The reversal of 22624721 is 12742622.

It is not a de Polignac number, because 22624721 - 2¹⁴ = 22608337 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22624781) 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 11 ways as a sum of consecutive naturals, for example, 1286 + ... + 6848.

It is an arithmetic number, because the mean of its divisors is an integer number (2220036).

Almost surely, 2^22624721 is an apocalyptic number.

It is an amenable number.

22624721 is a deficient number, since it is larger than the sum of its proper divisors (4015711).

22624721 is an equidigital number, since it uses as much as digits as its factorization.

22624721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5660 (or 5653 counting only the distinct ones).

The product of its digits is 2688, while the sum is 26.

The square root of 22624721 is about 4756.5450696908. The cubic root of 22624721 is about 282.8314787036.

The spelling of 22624721 in words is "twenty-two million, six hundred twenty-four thousand, seven hundred twenty-one".