21745557430536 has 16 divisors (see below), whose sum is σ = 54363893576400. Its totient is φ = 7248519143504.

The previous prime is 21745557430507. The next prime is 21745557430543. The reversal of 21745557430536 is 63503475554712.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 453032446446 + ... + 453032446493.

It is an arithmetic number, because the mean of its divisors is an integer number (3397743348525).

Almost surely, 2^{21745557430536} is an apocalyptic number.

It is an amenable number.

21745557430536 is an abundant number, since it is smaller than the sum of its proper divisors (32618336145864).

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

21745557430536 is a wasteful number, since it uses less digits than its factorization.

21745557430536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 906064892948 (or 906064892944 counting only the distinct ones).

The product of its (nonzero) digits is 52920000, while the sum is 57.

The spelling of 21745557430536 in words is "twenty-one trillion, seven hundred forty-five billion, five hundred fifty-seven million, four hundred thirty thousand, five hundred thirty-six".