12111123131231 has 2 divisors, whose sum is σ = 12111123131232. Its totient is φ = 12111123131230.

The previous prime is 12111123131171. The next prime is 12111123131243. The reversal of 12111123131231 is 13213132111121.

It is a strong prime.

It is an emirp because it is prime and its reverse (13213132111121) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12111123131231 is a prime.

It is a super-2 number, since 2×12111123131231² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12111123131197 and 12111123131206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12111123131251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6055561565615 + 6055561565616.

It is an arithmetic number, because the mean of its divisors is an integer number (6055561565616).

Almost surely, 2^{12111123131231} is an apocalyptic number.

12111123131231 is a deficient number, since it is larger than the sum of its proper divisors (1).

12111123131231 is an equidigital number, since it uses as much as digits as its factorization.

12111123131231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 216, while the sum is 23.

Adding to 12111123131231 its reverse (13213132111121), we get a palindrome (25324255242352).

The spelling of 12111123131231 in words is "twelve trillion, one hundred eleven billion, one hundred twenty-three million, one hundred thirty-one thousand, two hundred thirty-one".