108856108921 has 4 divisors (see below), whose sum is σ = 124406981632. Its totient is φ = 93305236212.

The previous prime is 108856108903. The next prime is 108856108937. The reversal of 108856108921 is 129801658801.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 108856108921 - 2⁷ = 108856108793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (108856108961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7775436345 + ... + 7775436358.

It is an arithmetic number, because the mean of its divisors is an integer number (31101745408).

Almost surely, 2^108856108921 is an apocalyptic number.

It is an amenable number.

108856108921 is a deficient number, since it is larger than the sum of its proper divisors (15550872711).

108856108921 is an equidigital number, since it uses as much as digits as its factorization.

108856108921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15550872710.

The product of its (nonzero) digits is 276480, while the sum is 49.

The spelling of 108856108921 in words is "one hundred eight billion, eight hundred fifty-six million, one hundred eight thousand, nine hundred twenty-one".