12218949317 has 2 divisors, whose sum is σ = 12218949318. Its totient is φ = 12218949316.

The previous prime is 12218949313. The next prime is 12218949511. The reversal of 12218949317 is 71394981221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11027940196 + 1191009121 = 105014^2 + 34511^2 .

It is an emirp because it is prime and its reverse (71394981221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12218949317 - 2² = 12218949313 is a prime.

It is a super-2 number, since 2×12218949317² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12218949311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6109474658 + 6109474659.

It is an arithmetic number, because the mean of its divisors is an integer number (6109474659).

Almost surely, 2^12218949317 is an apocalyptic number.

It is an amenable number.

12218949317 is a deficient number, since it is larger than the sum of its proper divisors (1).

12218949317 is an equidigital number, since it uses as much as digits as its factorization.

12218949317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 47.

The spelling of 12218949317 in words is "twelve billion, two hundred eighteen million, nine hundred forty-nine thousand, three hundred seventeen".