12011213231 has 2 divisors, whose sum is σ = 12011213232. Its totient is φ = 12011213230.

The previous prime is 12011213161. The next prime is 12011213233. The reversal of 12011213231 is 13231211021.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12011213231 is a prime.

It is a super-2 number, since 2×12011213231² (a number of 21 digits) contains 22 as substring.

Together with 12011213233, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12011213233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6005606615 + 6005606616.

It is an arithmetic number, because the mean of its divisors is an integer number (6005606616).

Almost surely, 2^12011213231 is an apocalyptic number.

12011213231 is a deficient number, since it is larger than the sum of its proper divisors (1).

12011213231 is an equidigital number, since it uses as much as digits as its factorization.

12011213231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 12011213231 its reverse (13231211021), we get a palindrome (25242424252).

The spelling of 12011213231 in words is "twelve billion, eleven million, two hundred thirteen thousand, two hundred thirty-one".