12011101231 has 2 divisors, whose sum is σ = 12011101232. Its totient is φ = 12011101230.

The previous prime is 12011101217. The next prime is 12011101259. The reversal of 12011101231 is 13210111021.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12011101231 - 2⁹ = 12011100719 is a prime.

It is a super-2 number, since 2×12011101231² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12011101031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6005550615 + 6005550616.

It is an arithmetic number, because the mean of its divisors is an integer number (6005550616).

Almost surely, 2^12011101231 is an apocalyptic number.

12011101231 is a deficient number, since it is larger than the sum of its proper divisors (1).

12011101231 is an equidigital number, since it uses as much as digits as its factorization.

12011101231 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 13.

Adding to 12011101231 its reverse (13210111021), we get a palindrome (25221212252).

The spelling of 12011101231 in words is "twelve billion, eleven million, one hundred one thousand, two hundred thirty-one".