21052992 has 56 divisors (see below), whose sum is σ = 56912256. Its totient is φ = 6865408.

The previous prime is 21052979. The next prime is 21053009. The reversal of 21052992 is 29925012.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7858 + ... + 10190.

Almost surely, 2^21052992 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21052992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28456128).

21052992 is an abundant number, since it is smaller than the sum of its proper divisors (35859264).

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

21052992 is a wasteful number, since it uses less digits than its factorization.

21052992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2395 (or 2385 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 21052992 is about 4588.3539532168. The cubic root of 21052992 is about 276.1242876480.

The spelling of 21052992 in words is "twenty-one million, fifty-two thousand, nine hundred ninety-two".