12131304217 has 2 divisors, whose sum is σ = 12131304218. Its totient is φ = 12131304216.

The previous prime is 12131304191. The next prime is 12131304271. The reversal of 12131304217 is 71240313121.

Together with next prime (12131304271) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7598783241 + 4532520976 = 87171^2 + 67324^2 .

It is a cyclic number.

It is not a de Polignac number, because 12131304217 - 2⁷ = 12131304089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12131304191 and 12131304200.

It is not a weakly prime, because it can be changed into another prime (12131304517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6065652108 + 6065652109.

It is an arithmetic number, because the mean of its divisors is an integer number (6065652109).

Almost surely, 2^12131304217 is an apocalyptic number.

It is an amenable number.

12131304217 is a deficient number, since it is larger than the sum of its proper divisors (1).

12131304217 is an equidigital number, since it uses as much as digits as its factorization.

12131304217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 25.

Adding to 12131304217 its reverse (71240313121), we get a palindrome (83371617338).

The spelling of 12131304217 in words is "twelve billion, one hundred thirty-one million, three hundred four thousand, two hundred seventeen".