21856792 has 8 divisors (see below), whose sum is σ = 40981500. Its totient is φ = 10928392.

The previous prime is 21856763. The next prime is 21856801. The reversal of 21856792 is 29765812.

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, 1366042 + ... + 1366057.

Almost surely, 2^21856792 is an apocalyptic number.

It is an amenable number.

21856792 is a deficient number, since it is larger than the sum of its proper divisors (19124708).

21856792 is a wasteful number, since it uses less digits than its factorization.

21856792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2732105 (or 2732101 counting only the distinct ones).

The product of its digits is 60480, while the sum is 40.

The square root of 21856792 is about 4675.1248111681. The cubic root of 21856792 is about 279.5946174541.

The spelling of 21856792 in words is "twenty-one million, eight hundred fifty-six thousand, seven hundred ninety-two".