21708079528 has 32 divisors (see below), whose sum is σ = 41030476200. Its totient is φ = 10766942208.

The previous prime is 21708079511. The next prime is 21708079553. The reversal of 21708079528 is 82597080712.

It can be written as a sum of positive squares in 4 ways, for example, as 19711598404 + 1996481124 = 140398^2 + 44682^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 525118 + ... + 564946.

Almost surely, 2^21708079528 is an apocalyptic number.

It is an amenable number.

21708079528 is a deficient number, since it is larger than the sum of its proper divisors (19322396672).

21708079528 is a wasteful number, since it uses less digits than its factorization.

21708079528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40381 (or 40377 counting only the distinct ones).

The product of its (nonzero) digits is 564480, while the sum is 49.

The spelling of 21708079528 in words is "twenty-one billion, seven hundred eight million, seventy-nine thousand, five hundred twenty-eight".