12131234321 has 2 divisors, whose sum is σ = 12131234322. Its totient is φ = 12131234320.

The previous prime is 12131234317. The next prime is 12131234327. The reversal of 12131234321 is 12343213121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9443952400 + 2687281921 = 97180^2 + 51839^2 .

It is a cyclic number.

It is not a de Polignac number, because 12131234321 - 2² = 12131234317 is a prime.

It is not a weakly prime, because it can be changed into another prime (12131234327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6065617160 + 6065617161.

It is an arithmetic number, because the mean of its divisors is an integer number (6065617161).

Almost surely, 2^12131234321 is an apocalyptic number.

It is an amenable number.

12131234321 is a deficient number, since it is larger than the sum of its proper divisors (1).

12131234321 is an equidigital number, since it uses as much as digits as its factorization.

12131234321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 23.

Adding to 12131234321 its reverse (12343213121), we get a palindrome (24474447442).

The spelling of 12131234321 in words is "twelve billion, one hundred thirty-one million, two hundred thirty-four thousand, three hundred twenty-one".