22690621 has 4 divisors (see below), whose sum is σ = 22717372. Its totient is φ = 22663872.

The previous prime is 22690607. The next prime is 22690643. The reversal of 22690621 is 12609622.

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 15319396 + 7371225 = 3914^2 + 2715^2 .

It is a cyclic number.

It is not a de Polignac number, because 22690621 - 2¹⁵ = 22657853 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22690621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22690601) 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, 12060 + ... + 13813.

It is an arithmetic number, because the mean of its divisors is an integer number (5679343).

Almost surely, 2^22690621 is an apocalyptic number.

It is an amenable number.

22690621 is a deficient number, since it is larger than the sum of its proper divisors (26751).

22690621 is an equidigital number, since it uses as much as digits as its factorization.

22690621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26750.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 22690621 is about 4763.4673295825. The cubic root of 22690621 is about 283.1058176622.

The spelling of 22690621 in words is "twenty-two million, six hundred ninety thousand, six hundred twenty-one".