21615611402652 has 48 divisors (see below), whose sum is σ = 51103243699200. Its totient is φ = 7110145404928.

The previous prime is 21615611402543. The next prime is 21615611402849. The reversal of 21615611402652 is 25620411651612.

It is a happy number.

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, 11714277 + ... + 13433372.

It is an arithmetic number, because the mean of its divisors is an integer number (1064650910400).

Almost surely, 2^{21615611402652} is an apocalyptic number.

It is an amenable number.

21615611402652 is an abundant number, since it is smaller than the sum of its proper divisors (29487632296548).

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

21615611402652 is a wasteful number, since it uses less digits than its factorization.

21615611402652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25148602 (or 25148600 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 42.

The spelling of 21615611402652 in words is "twenty-one trillion, six hundred fifteen billion, six hundred eleven million, four hundred two thousand, six hundred fifty-two".