12123131311 has 4 divisors (see below), whose sum is σ = 12133345752. Its totient is φ = 12112916872.

The previous prime is 12123131291. The next prime is 12123131369. The reversal of 12123131311 is 11313132121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11313132121 = 34607 ⋅326903.

It is a cyclic number.

It is not a de Polignac number, because 12123131311 - 2²⁵ = 12089576879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12123131381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5105440 + ... + 5107813.

It is an arithmetic number, because the mean of its divisors is an integer number (3033336438).

Almost surely, 2^12123131311 is an apocalyptic number.

12123131311 is a deficient number, since it is larger than the sum of its proper divisors (10214441).

12123131311 is a wasteful number, since it uses less digits than its factorization.

12123131311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10214440.

The product of its digits is 108, while the sum is 19.

Adding to 12123131311 its reverse (11313132121), we get a palindrome (23436263432).

The spelling of 12123131311 in words is "twelve billion, one hundred twenty-three million, one hundred thirty-one thousand, three hundred eleven".