12123112131 has 40 divisors (see below), whose sum is σ = 20650158144. Its totient is φ = 7021520640.

The previous prime is 12123112129. The next prime is 12123112151. The reversal of 12123112131 is 13121132121.

It is not a de Polignac number, because 12123112131 - 2¹ = 12123112129 is a prime.

It is a super-2 number, since 2×12123112131² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12123112151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 320715 + ... + 356516.

Almost surely, 2^12123112131 is an apocalyptic number.

12123112131 is a deficient number, since it is larger than the sum of its proper divisors (8527046013).

12123112131 is a wasteful number, since it uses less digits than its factorization.

12123112131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 677273 (or 677264 counting only the distinct ones).

The product of its digits is 72, while the sum is 18.

Adding to 12123112131 its reverse (13121132121), we get a palindrome (25244244252).

The spelling of 12123112131 in words is "twelve billion, one hundred twenty-three million, one hundred twelve thousand, one hundred thirty-one".