12111111101231 has 2 divisors, whose sum is σ = 12111111101232. Its totient is φ = 12111111101230.

The previous prime is 12111111101203. The next prime is 12111111101239. The reversal of 12111111101231 is 13210111111121.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12111111101231 is a prime.

It is a super-2 number, since 2×12111111101231² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12111111101239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6055555550615 + 6055555550616.

It is an arithmetic number, because the mean of its divisors is an integer number (6055555550616).

Almost surely, 2^{12111111101231} is an apocalyptic number.

12111111101231 is a deficient number, since it is larger than the sum of its proper divisors (1).

12111111101231 is an equidigital number, since it uses as much as digits as its factorization.

12111111101231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12, while the sum is 17.

Adding to 12111111101231 its reverse (13210111111121), we get a palindrome (25321222212352).

The spelling of 12111111101231 in words is "twelve trillion, one hundred eleven billion, one hundred eleven million, one hundred one thousand, two hundred thirty-one".