21317580762540 has 96 divisors (see below), whose sum is σ = 61708425913344. Its totient is φ = 5494418438400.

The previous prime is 21317580762481. The next prime is 21317580762557. The reversal of 21317580762540 is 4526708571312.

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, 31461184 + ... + 32131623.

It is an arithmetic number, because the mean of its divisors is an integer number (642796103264).

Almost surely, 2^{21317580762540} is an apocalyptic number.

21317580762540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21317580762540 is an abundant number, since it is smaller than the sum of its proper divisors (40390845150804).

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

21317580762540 is a wasteful number, since it uses less digits than its factorization.

21317580762540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63593007 (or 63593005 counting only the distinct ones).

The product of its (nonzero) digits is 2822400, while the sum is 51.

The spelling of 21317580762540 in words is "twenty-one trillion, three hundred seventeen billion, five hundred eighty million, seven hundred sixty-two thousand, five hundred forty".