23908105921 has 12 divisors (see below), whose sum is σ = 27817404480. Its totient is φ = 20488289640.

The previous prime is 23908105831. The next prime is 23908105931. The reversal of 23908105921 is 12950180932.

It is not a de Polignac number, because 23908105921 - 2¹¹ = 23908103873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23908105931) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 191436 + ... + 290626.

It is an arithmetic number, because the mean of its divisors is an integer number (2318117040).

Almost surely, 2^23908105921 is an apocalyptic number.

It is an amenable number.

23908105921 is a deficient number, since it is larger than the sum of its proper divisors (3909298559).

23908105921 is an equidigital number, since it uses as much as digits as its factorization.

23908105921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104124 (or 104117 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 40.

The spelling of 23908105921 in words is "twenty-three billion, nine hundred eight million, one hundred five thousand, nine hundred twenty-one".