21040792 has 8 divisors (see below), whose sum is σ = 39451500. Its totient is φ = 10520392.

The previous prime is 21040787. The next prime is 21040807. The reversal of 21040792 is 29704012.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1315042 + ... + 1315057.

Almost surely, 2^21040792 is an apocalyptic number.

It is an amenable number.

21040792 is a deficient number, since it is larger than the sum of its proper divisors (18410708).

21040792 is a wasteful number, since it uses less digits than its factorization.

21040792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2630105 (or 2630101 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 21040792 is about 4587.0243077621. The cubic root of 21040792 is about 276.0709402468.

The spelling of 21040792 in words is "twenty-one million, forty thousand, seven hundred ninety-two".