21025992 has 32 divisors (see below), whose sum is σ = 56609280. Its totient is φ = 6469440.

The previous prime is 21025987. The next prime is 21026053. The reversal of 21025992 is 29952012.

It is a super-4 number, since 4×21025992⁴ (a number of 30 digits) contains 4444 as substring.

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, 33384 + ... + 34007.

It is an arithmetic number, because the mean of its divisors is an integer number (1769040).

Almost surely, 2^21025992 is an apocalyptic number.

It is an amenable number.

21025992 is an abundant number, since it is smaller than the sum of its proper divisors (35583288).

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

21025992 is a wasteful number, since it uses less digits than its factorization.

21025992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67413 (or 67409 counting only the distinct ones).

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

The square root of 21025992 is about 4585.4107776730. The cubic root of 21025992 is about 276.0061960382.

The spelling of 21025992 in words is "twenty-one million, twenty-five thousand, nine hundred ninety-two".