22621135657 has 4 divisors (see below), whose sum is σ = 22622315860. Its totient is φ = 22619955456.

The previous prime is 22621135639. The next prime is 22621135679. The reversal of 22621135657 is 75653112622.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75653112622 = 2 ⋅37826556311.

It can be written as a sum of positive squares in 2 ways, for example, as 12212239081 + 10408896576 = 110509^2 + 102024^2 .

It is a cyclic number.

It is not a de Polignac number, because 22621135657 - 2⁷ = 22621135529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22621130657) 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, 560868 + ... + 599845.

It is an arithmetic number, because the mean of its divisors is an integer number (5655578965).

Almost surely, 2^22621135657 is an apocalyptic number.

It is an amenable number.

22621135657 is a deficient number, since it is larger than the sum of its proper divisors (1180203).

22621135657 is a wasteful number, since it uses less digits than its factorization.

22621135657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1180202.

The product of its digits is 151200, while the sum is 40.

The spelling of 22621135657 in words is "twenty-two billion, six hundred twenty-one million, one hundred thirty-five thousand, six hundred fifty-seven".