21375127056516 has 48 divisors (see below), whose sum is σ = 50199984394560. Its totient is φ = 7078761558400.

The previous prime is 21375127056511. The next prime is 21375127056541. The reversal of 21375127056516 is 61565072157312.

It is not an unprimeable number, because it can be changed into a prime (21375127056511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4792146 + ... + 8106473.

It is an arithmetic number, because the mean of its divisors is an integer number (1045833008220).

Almost surely, 2^{21375127056516} is an apocalyptic number.

It is an amenable number.

21375127056516 is an abundant number, since it is smaller than the sum of its proper divisors (28824857338044).

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

21375127056516 is a wasteful number, since it uses less digits than its factorization.

21375127056516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12899524 (or 12899522 counting only the distinct ones).

The product of its (nonzero) digits is 2646000, while the sum is 51.

The spelling of 21375127056516 in words is "twenty-one trillion, three hundred seventy-five billion, one hundred twenty-seven million, fifty-six thousand, five hundred sixteen".