21715792 has 20 divisors (see below), whose sum is σ = 48085216. Its totient is φ = 9306720.

The previous prime is 21715777. The next prime is 21715807. The reversal of 21715792 is 29751712.

It is an interprime number because it is at equal distance from previous prime (21715777) and next prime (21715807).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 96834 + ... + 97057.

Almost surely, 2^21715792 is an apocalyptic number.

It is an amenable number.

21715792 is an abundant number, since it is smaller than the sum of its proper divisors (26369424).

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

21715792 is a wasteful number, since it uses less digits than its factorization.

21715792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193906 (or 193900 counting only the distinct ones).

The product of its digits is 8820, while the sum is 34.

The square root of 21715792 is about 4660.0206008128. The cubic root of 21715792 is about 278.9920904906.

The spelling of 21715792 in words is "twenty-one million, seven hundred fifteen thousand, seven hundred ninety-two".