21706792 has 8 divisors (see below), whose sum is σ = 40700250. Its totient is φ = 10853392.

The previous prime is 21706777. The next prime is 21706813. The reversal of 21706792 is 29760712.

It can be written as a sum of positive squares in only one way, i.e., 21399876 + 306916 = 4626^2 + 554^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1356667 + ... + 1356682.

Almost surely, 2^21706792 is an apocalyptic number.

It is an amenable number.

21706792 is a deficient number, since it is larger than the sum of its proper divisors (18993458).

21706792 is a wasteful number, since it uses less digits than its factorization.

21706792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2713355 (or 2713351 counting only the distinct ones).

The product of its (nonzero) digits is 10584, while the sum is 34.

The square root of 21706792 is about 4659.0548397717. The cubic root of 21706792 is about 278.9535428786.

The spelling of 21706792 in words is "twenty-one million, seven hundred six thousand, seven hundred ninety-two".