11111111212217 has 2 divisors, whose sum is σ = 11111111212218. Its totient is φ = 11111111212216.

The previous prime is 11111111212177. The next prime is 11111111212237. The reversal of 11111111212217 is 71221211111111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10976903285881 + 134207926336 = 3313141^2 + 366344^2 .

It is a cyclic number.

It is not a de Polignac number, because 11111111212217 - 2⁶ = 11111111212153 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11111111212192 and 11111111212201.

It is not a weakly prime, because it can be changed into another prime (11111111212237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5555555606108 + 5555555606109.

It is an arithmetic number, because the mean of its divisors is an integer number (5555555606109).

Almost surely, 2^{11111111212217} is an apocalyptic number.

It is an amenable number.

11111111212217 is a deficient number, since it is larger than the sum of its proper divisors (1).

11111111212217 is an equidigital number, since it uses as much as digits as its factorization.

11111111212217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 56, while the sum is 23.

Adding to 11111111212217 its reverse (71221211111111), we get a palindrome (82332322323328).

The spelling of 11111111212217 in words is "eleven trillion, one hundred eleven billion, one hundred eleven million, two hundred twelve thousand, two hundred seventeen".