11111011111217 has 2 divisors, whose sum is σ = 11111011111218. Its totient is φ = 11111011111216.

The previous prime is 11111011111199. The next prime is 11111011111247. The reversal of 11111011111217 is 71211111011111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6415486160161 + 4695524951056 = 2532881^2 + 2166916^2 .

It is a cyclic number.

It is not a de Polignac number, because 11111011111217 - 2²⁴ = 11110994334001 is a prime.

It is not a weakly prime, because it can be changed into another prime (11111011111247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5555505555608 + 5555505555609.

It is an arithmetic number, because the mean of its divisors is an integer number (5555505555609).

Almost surely, 2^{11111011111217} is an apocalyptic number.

It is an amenable number.

11111011111217 is a deficient number, since it is larger than the sum of its proper divisors (1).

11111011111217 is an equidigital number, since it uses as much as digits as its factorization.

11111011111217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14, while the sum is 20.

Adding to 11111011111217 its reverse (71211111011111), we get a palindrome (82322122122328).

The spelling of 11111011111217 in words is "eleven trillion, one hundred eleven billion, eleven million, one hundred eleven thousand, two hundred seventeen".