21745505317032 has 128 divisors (see below), whose sum is σ = 69171696000000. Its totient is φ = 6200550399168.

The previous prime is 21745505316989. The next prime is 21745505317073. The reversal of 21745505317032 is 23071350554712.

21745505317032 is a `hidden beast` number, since 2 + 1 + 7 + 4 + 550 + 53 + 17 + 0 + 32 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13656282 + ... + 15165257.

It is an arithmetic number, because the mean of its divisors is an integer number (540403875000).

Almost surely, 2^{21745505317032} is an apocalyptic number.

It is an amenable number.

21745505317032 is an abundant number, since it is smaller than the sum of its proper divisors (47426190682968).

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

21745505317032 is a wasteful number, since it uses less digits than its factorization.

21745505317032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28822060 (or 28822050 counting only the distinct ones).

The product of its (nonzero) digits is 882000, while the sum is 45.

The spelling of 21745505317032 in words is "twenty-one trillion, seven hundred forty-five billion, five hundred five million, three hundred seventeen thousand, thirty-two".