12217926817 has 2 divisors, whose sum is σ = 12217926818. Its totient is φ = 12217926816.

The previous prime is 12217926781. The next prime is 12217926821. The reversal of 12217926817 is 71862971221.

Together with previous prime (12217926781) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10807473681 + 1410453136 = 103959^2 + 37556^2 .

It is an emirp because it is prime and its reverse (71862971221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12217926817 - 2¹⁵ = 12217894049 is a prime.

It is not a weakly prime, because it can be changed into another prime (12217926857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6108963408 + 6108963409.

It is an arithmetic number, because the mean of its divisors is an integer number (6108963409).

Almost surely, 2^12217926817 is an apocalyptic number.

It is an amenable number.

12217926817 is a deficient number, since it is larger than the sum of its proper divisors (1).

12217926817 is an equidigital number, since it uses as much as digits as its factorization.

12217926817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 169344, while the sum is 46.

It can be divided in two parts, 122179 and 26817, that added together give a square (148996 = 386²).

The spelling of 12217926817 in words is "twelve billion, two hundred seventeen million, nine hundred twenty-six thousand, eight hundred seventeen".