21024992 has 24 divisors (see below), whose sum is σ = 42075432. Its totient is φ = 10339200.

The previous prime is 21024961. The next prime is 21025019. The reversal of 21024992 is 29942012.

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, 3434 + ... + 7337.

It is an arithmetic number, because the mean of its divisors is an integer number (1753143).

Almost surely, 2^21024992 is an apocalyptic number.

It is an amenable number.

21024992 is an abundant number, since it is smaller than the sum of its proper divisors (21050440).

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

21024992 is a wasteful number, since it uses less digits than its factorization.

21024992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10842 (or 10834 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 21024992 is about 4585.3017348916. The cubic root of 21024992 is about 276.0018203339.

The spelling of 21024992 in words is "twenty-one million, twenty-four thousand, nine hundred ninety-two".