12013213231 has 2 divisors, whose sum is σ = 12013213232. Its totient is φ = 12013213230.

The previous prime is 12013213211. The next prime is 12013213259. The reversal of 12013213231 is 13231231021.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12013213231 - 2⁷ = 12013213103 is a prime.

It is a super-2 number, since 2×12013213231² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12013213199 and 12013213208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12013213211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6006606615 + 6006606616.

It is an arithmetic number, because the mean of its divisors is an integer number (6006606616).

Almost surely, 2^12013213231 is an apocalyptic number.

12013213231 is a deficient number, since it is larger than the sum of its proper divisors (1).

12013213231 is an equidigital number, since it uses as much as digits as its factorization.

12013213231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 12013213231 its reverse (13231231021), we get a palindrome (25244444252).

The spelling of 12013213231 in words is "twelve billion, thirteen million, two hundred thirteen thousand, two hundred thirty-one".