12122211217 has 2 divisors, whose sum is σ = 12122211218. Its totient is φ = 12122211216.

The previous prime is 12122211187. The next prime is 12122211221. The reversal of 12122211217 is 71211222121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12080427921 + 41783296 = 109911^2 + 6464^2 .

It is a cyclic number.

It is not a de Polignac number, because 12122211217 - 2⁷ = 12122211089 is a prime.

It is not a weakly prime, because it can be changed into another prime (12122211317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6061105608 + 6061105609.

It is an arithmetic number, because the mean of its divisors is an integer number (6061105609).

Almost surely, 2^12122211217 is an apocalyptic number.

It is an amenable number.

12122211217 is a deficient number, since it is larger than the sum of its proper divisors (1).

12122211217 is an equidigital number, since it uses as much as digits as its factorization.

12122211217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 224, while the sum is 22.

Adding to 12122211217 its reverse (71211222121), we get a palindrome (83333433338).

The spelling of 12122211217 in words is "twelve billion, one hundred twenty-two million, two hundred eleven thousand, two hundred seventeen".