108891332921 has 32 divisors (see below), whose sum is σ = 130102602240. Its totient is φ = 89163680256.

The previous prime is 108891332819. The next prime is 108891332923. The reversal of 108891332921 is 129233198801.

It is a happy number.

It is not a de Polignac number, because 108891332921 - 2²⁶ = 108824224057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (108891332923) 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, 44681315 + ... + 44683751.

It is an arithmetic number, because the mean of its divisors is an integer number (4065706320).

Almost surely, 2^108891332921 is an apocalyptic number.

It is an amenable number.

108891332921 is a deficient number, since it is larger than the sum of its proper divisors (21211269319).

108891332921 is a wasteful number, since it uses less digits than its factorization.

108891332921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4713.

The product of its (nonzero) digits is 186624, while the sum is 47.

The spelling of 108891332921 in words is "one hundred eight billion, eight hundred ninety-one million, three hundred thirty-two thousand, nine hundred twenty-one".