21715617747324 has 24 divisors (see below), whose sum is σ = 50682136355200. Its totient is φ = 7236773304624.

The previous prime is 21715617747323. The next prime is 21715617747413. The reversal of 21715617747324 is 42374771651712.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21715617747323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 220691824 + ... + 220790199.

Almost surely, 2^{21715617747324} is an apocalyptic number.

It is an amenable number.

21715617747324 is an abundant number, since it is smaller than the sum of its proper divisors (28966518607876).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21715617747324 is a wasteful number, since it uses less digits than its factorization.

21715617747324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441486129 (or 441486127 counting only the distinct ones).

The product of its digits is 13829760, while the sum is 57.

The spelling of 21715617747324 in words is "twenty-one trillion, seven hundred fifteen billion, six hundred seventeen million, seven hundred forty-seven thousand, three hundred twenty-four".