100533566721 has 32 divisors (see below), whose sum is σ = 153491482368. Its totient is φ = 57336330240.

The previous prime is 100533566701. The next prime is 100533566729. The reversal of 100533566721 is 127665335001.

It is not a de Polignac number, because 100533566721 - 2¹⁰ = 100533565697 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 100533566721.

It is not an unprimeable number, because it can be changed into a prime (100533566729) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 38180821 + ... + 38183453.

It is an arithmetic number, because the mean of its divisors is an integer number (4796608824).

Almost surely, 2^100533566721 is an apocalyptic number.

It is an amenable number.

100533566721 is a deficient number, since it is larger than the sum of its proper divisors (52957915647).

100533566721 is a wasteful number, since it uses less digits than its factorization.

100533566721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5481.

The product of its (nonzero) digits is 113400, while the sum is 39.

The spelling of 100533566721 in words is "one hundred billion, five hundred thirty-three million, five hundred sixty-six thousand, seven hundred twenty-one".