21507532274704 has 40 divisors (see below), whose sum is σ = 48595736201600. Its totient is φ = 9217513829664.

The previous prime is 21507532274681. The next prime is 21507532274713. The reversal of 21507532274704 is 40747223570512.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1959500004 + ... + 1959510979.

It is an arithmetic number, because the mean of its divisors is an integer number (1214893405040).

Almost surely, 2^{21507532274704} is an apocalyptic number.

It is an amenable number.

21507532274704 is an abundant number, since it is smaller than the sum of its proper divisors (27088203926896).

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

21507532274704 is an equidigital number, since it uses as much as digits as its factorization.

21507532274704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3919011012 (or 3919010992 counting only the distinct ones).

The product of its (nonzero) digits is 3292800, while the sum is 49.

The spelling of 21507532274704 in words is "twenty-one trillion, five hundred seven billion, five hundred thirty-two million, two hundred seventy-four thousand, seven hundred four".