12355221317 has 2 divisors, whose sum is σ = 12355221318. Its totient is φ = 12355221316.

The previous prime is 12355221313. The next prime is 12355221341. The reversal of 12355221317 is 71312255321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10202818081 + 2152403236 = 101009^2 + 46394^2 .

It is a cyclic number.

It is not a de Polignac number, because 12355221317 - 2² = 12355221313 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12355221313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6177610658 + 6177610659.

It is an arithmetic number, because the mean of its divisors is an integer number (6177610659).

Almost surely, 2^12355221317 is an apocalyptic number.

It is an amenable number.

12355221317 is a deficient number, since it is larger than the sum of its proper divisors (1).

12355221317 is an equidigital number, since it uses as much as digits as its factorization.

12355221317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12600, while the sum is 32.

Adding to 12355221317 its reverse (71312255321), we get a palindrome (83667476638).

The spelling of 12355221317 in words is "twelve billion, three hundred fifty-five million, two hundred twenty-one thousand, three hundred seventeen".