12108987171 has 12 divisors (see below), whose sum is σ = 18519627672. Its totient is φ = 7597795776.

The previous prime is 12108987157. The next prime is 12108987173. The reversal of 12108987171 is 17178980121.

It is not a de Polignac number, because 12108987171 - 2²² = 12104792867 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12108987173) 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, 39571701 + ... + 39572006.

It is an arithmetic number, because the mean of its divisors is an integer number (1543302306).

Almost surely, 2^12108987171 is an apocalyptic number.

12108987171 is a deficient number, since it is larger than the sum of its proper divisors (6410640501).

12108987171 is a wasteful number, since it uses less digits than its factorization.

12108987171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79143730 (or 79143727 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 45.

The spelling of 12108987171 in words is "twelve billion, one hundred eight million, nine hundred eighty-seven thousand, one hundred seventy-one".