12105857949 has 16 divisors (see below), whose sum is σ = 16407321792. Its totient is φ = 7937854848.

The previous prime is 12105857909. The next prime is 12105857971. The reversal of 12105857949 is 94975850121.

It is not a de Polignac number, because 12105857949 - 2¹² = 12105853853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12105857909) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85137 + ... + 177369.

It is an arithmetic number, because the mean of its divisors is an integer number (1025457612).

Almost surely, 2^12105857949 is an apocalyptic number.

It is an amenable number.

12105857949 is a deficient number, since it is larger than the sum of its proper divisors (4301463843).

12105857949 is an equidigital number, since it uses as much as digits as its factorization.

12105857949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92956.

The product of its (nonzero) digits is 907200, while the sum is 51.

The spelling of 12105857949 in words is "twelve billion, one hundred five million, eight hundred fifty-seven thousand, nine hundred forty-nine".