12111321217 has 2 divisors, whose sum is σ = 12111321218. Its totient is φ = 12111321216.

The previous prime is 12111321199. The next prime is 12111321223. The reversal of 12111321217 is 71212311121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10864101361 + 1247219856 = 104231^2 + 35316^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12111321217 is a prime.

It is a super-2 number, since 2×12111321217² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12111321227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6055660608 + 6055660609.

It is an arithmetic number, because the mean of its divisors is an integer number (6055660609).

Almost surely, 2^12111321217 is an apocalyptic number.

It is an amenable number.

12111321217 is a deficient number, since it is larger than the sum of its proper divisors (1).

12111321217 is an equidigital number, since it uses as much as digits as its factorization.

12111321217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 168, while the sum is 22.

Adding to 12111321217 its reverse (71212311121), we get a palindrome (83323632338).

The spelling of 12111321217 in words is "twelve billion, one hundred eleven million, three hundred twenty-one thousand, two hundred seventeen".