21313922 has 12 divisors (see below), whose sum is σ = 37190790. Its totient is φ = 9134496.

The previous prime is 21313913. The next prime is 21313931. The reversal of 21313922 is 22931312.

It is an interprime number because it is at equal distance from previous prime (21313913) and next prime (21313931).

It can be written as a sum of positive squares in only one way, i.e., 18653761 + 2660161 = 4319^2 + 1631^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 108647 + ... + 108842.

Almost surely, 2^21313922 is an apocalyptic number.

21313922 is a deficient number, since it is larger than the sum of its proper divisors (15876868).

21313922 is a wasteful number, since it uses less digits than its factorization.

21313922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217505 (or 217498 counting only the distinct ones).

The product of its digits is 648, while the sum is 23.

The square root of 21313922 is about 4616.7003368207. The cubic root of 21313922 is about 277.2603650462.

The spelling of 21313922 in words is "twenty-one million, three hundred thirteen thousand, nine hundred twenty-two".