21715660124 has 48 divisors (see below), whose sum is σ = 41081009760. Its totient is φ = 10006364160.

The previous prime is 21715660117. The next prime is 21715660189. The reversal of 21715660124 is 42106651712.

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, 1020554 + ... + 1041614.

It is an arithmetic number, because the mean of its divisors is an integer number (855854370).

Almost surely, 2^21715660124 is an apocalyptic number.

It is an amenable number.

21715660124 is a deficient number, since it is larger than the sum of its proper divisors (19365349636).

21715660124 is a wasteful number, since it uses less digits than its factorization.

21715660124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21398 (or 21396 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 35.

The spelling of 21715660124 in words is "twenty-one billion, seven hundred fifteen million, six hundred sixty thousand, one hundred twenty-four".