12111217 has 2 divisors, whose sum is σ = 12111218. Its totient is φ = 12111216.

The previous prime is 12111199. The next prime is 12111221. The reversal of 12111217 is 71211121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11943936 + 167281 = 3456^2 + 409^2 .

It is an emirp because it is prime and its reverse (71211121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12111217 - 2¹¹ = 12109169 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12111217.

It is not a weakly prime, because it can be changed into another prime (12111287) 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, 6055608 + 6055609.

It is an arithmetic number, because the mean of its divisors is an integer number (6055609).

Almost surely, 2^12111217 is an apocalyptic number.

It is an amenable number.

12111217 is a deficient number, since it is larger than the sum of its proper divisors (1).

12111217 is an equidigital number, since it uses as much as digits as its factorization.

12111217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28, while the sum is 16.

The square root of 12111217 is about 3480.1173830778. The cubic root of 12111217 is about 229.6479617599.

Adding to 12111217 its reverse (71211121), we get a palindrome (83322338).

The spelling of 12111217 in words is "twelve million, one hundred eleven thousand, two hundred seventeen".