21715595914 has 12 divisors (see below), whose sum is σ = 33658046802. Its totient is φ = 10507545480.

The previous prime is 21715595903. The next prime is 21715595929. The reversal of 21715595914 is 41959551712.

It can be written as a sum of positive squares in only one way, i.e., 11154950689 + 10560645225 = 105617^2 + 102765^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5647297 + ... + 5651140.

Almost surely, 2^21715595914 is an apocalyptic number.

21715595914 is a deficient number, since it is larger than the sum of its proper divisors (11942450888).

21715595914 is a wasteful number, since it uses less digits than its factorization.

21715595914 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11298501 (or 11298470 counting only the distinct ones).

The product of its digits is 567000, while the sum is 49.

The spelling of 21715595914 in words is "twenty-one billion, seven hundred fifteen million, five hundred ninety-five thousand, nine hundred fourteen".