12105172317 has 12 divisors (see below), whose sum is σ = 18775369536. Its totient is φ = 6917241240.

The previous prime is 12105172307. The next prime is 12105172349. The reversal of 12105172317 is 71327150121.

It is not a de Polignac number, because 12105172317 - 2⁴ = 12105172301 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12105172307) 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, 41173909 + ... + 41174202.

It is an arithmetic number, because the mean of its divisors is an integer number (1564614128).

Almost surely, 2^12105172317 is an apocalyptic number.

It is an amenable number.

12105172317 is a deficient number, since it is larger than the sum of its proper divisors (6670197219).

12105172317 is an equidigital number, since it uses as much as digits as its factorization.

12105172317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82348128 (or 82348121 counting only the distinct ones).

The product of its (nonzero) digits is 2940, while the sum is 30.

The spelling of 12105172317 in words is "twelve billion, one hundred five million, one hundred seventy-two thousand, three hundred seventeen".