12131312111 has 2 divisors, whose sum is σ = 12131312112. Its totient is φ = 12131312110.

The previous prime is 12131312107. The next prime is 12131312117. The reversal of 12131312111 is 11121313121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12131312111 - 2² = 12131312107 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12131312111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12131312117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6065656055 + 6065656056.

It is an arithmetic number, because the mean of its divisors is an integer number (6065656056).

Almost surely, 2^12131312111 is an apocalyptic number.

12131312111 is a deficient number, since it is larger than the sum of its proper divisors (1).

12131312111 is an equidigital number, since it uses as much as digits as its factorization.

12131312111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36, while the sum is 17.

Adding to 12131312111 its reverse (11121313121), we get a palindrome (23252625232).

It can be divided in two parts, 121313121 and 11, that multiplied together give a palindrome (1334444331).

The spelling of 12131312111 in words is "twelve billion, one hundred thirty-one million, three hundred twelve thousand, one hundred eleven".