21292792 has 16 divisors (see below), whose sum is σ = 39974400. Its totient is φ = 10632960.

The previous prime is 21292781. The next prime is 21292813. The reversal of 21292792 is 29729212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9192 + ... + 11272.

It is an arithmetic number, because the mean of its divisors is an integer number (2498400).

Almost surely, 2^21292792 is an apocalyptic number.

It is an amenable number.

21292792 is a deficient number, since it is larger than the sum of its proper divisors (18681608).

21292792 is a wasteful number, since it uses less digits than its factorization.

21292792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3366 (or 3362 counting only the distinct ones).

The product of its digits is 9072, while the sum is 34.

The square root of 21292792 is about 4614.4113384049. The cubic root of 21292792 is about 277.1687121418.

The spelling of 21292792 in words is "twenty-one million, two hundred ninety-two thousand, seven hundred ninety-two".