21708700615 has 16 divisors (see below), whose sum is σ = 30732318720. Its totient is φ = 14405772960.

The previous prime is 21708700583. The next prime is 21708700621. The reversal of 21708700615 is 51600780712.

It is not a de Polignac number, because 21708700615 - 2⁵ = 21708700583 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10002925 + ... + 10005094.

It is an arithmetic number, because the mean of its divisors is an integer number (1920769920).

Almost surely, 2^21708700615 is an apocalyptic number.

21708700615 is a deficient number, since it is larger than the sum of its proper divisors (9023618105).

21708700615 is a wasteful number, since it uses less digits than its factorization.

21708700615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20008062.

The product of its (nonzero) digits is 23520, while the sum is 37.

The spelling of 21708700615 in words is "twenty-one billion, seven hundred eight million, seven hundred thousand, six hundred fifteen".