21926957 has 16 divisors (see below), whose sum is σ = 25546752. Its totient is φ = 18635520.

The previous prime is 21926941. The next prime is 21926959. The reversal of 21926957 is 75962912.

It is a cyclic number.

It is not a de Polignac number, because 21926957 - 2⁴ = 21926941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21926959) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9332 + ... + 11442.

It is an arithmetic number, because the mean of its divisors is an integer number (1596672).

Almost surely, 2^21926957 is an apocalyptic number.

It is an amenable number.

21926957 is a deficient number, since it is larger than the sum of its proper divisors (3619795).

21926957 is a wasteful number, since it uses less digits than its factorization.

21926957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2188.

The product of its digits is 68040, while the sum is 41.

The square root of 21926957 is about 4682.6228761240. The cubic root of 21926957 is about 279.8934841449.

The spelling of 21926957 in words is "twenty-one million, nine hundred twenty-six thousand, nine hundred fifty-seven".