21512792 has 16 divisors (see below), whose sum is σ = 46098960. Its totient is φ = 9219744.

The previous prime is 21512789. The next prime is 21512801. The reversal of 21512792 is 29721512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 192023 + ... + 192134.

It is an arithmetic number, because the mean of its divisors is an integer number (2881185).

Almost surely, 2^21512792 is an apocalyptic number.

It is an amenable number.

21512792 is an abundant number, since it is smaller than the sum of its proper divisors (24586168).

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

21512792 is a wasteful number, since it uses less digits than its factorization.

21512792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 384170 (or 384166 counting only the distinct ones).

The product of its digits is 2520, while the sum is 29.

The square root of 21512792 is about 4638.1884394664. The cubic root of 21512792 is about 278.1200247732.

The spelling of 21512792 in words is "twenty-one million, five hundred twelve thousand, seven hundred ninety-two".