21992376 has 48 divisors (see below), whose sum is σ = 63960840. Its totient is φ = 6283200.

The previous prime is 21992357. The next prime is 21992401. The reversal of 21992376 is 67329912.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8175 + ... + 10526.

Almost surely, 2^21992376 is an apocalyptic number.

It is an amenable number.

21992376 is an abundant number, since it is smaller than the sum of its proper divisors (41968464).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21992376 is a wasteful number, since it uses less digits than its factorization.

21992376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18724 (or 18713 counting only the distinct ones).

The product of its digits is 40824, while the sum is 39.

The square root of 21992376 is about 4689.6029682693. The cubic root of 21992376 is about 280.1715615261.

The spelling of 21992376 in words is "twenty-one million, nine hundred ninety-two thousand, three hundred seventy-six".