111221220202217 has 2 divisors, whose sum is σ = 111221220202218. Its totient is φ = 111221220202216.

The previous prime is 111221220202207. The next prime is 111221220202223. The reversal of 111221220202217 is 712202022122111.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71352805749481 + 39868414452736 = 8447059^2 + 6314144^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111221220202217 is a prime.

It is not a weakly prime, because it can be changed into another prime (111221220202207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55610610101108 + 55610610101109.

It is an arithmetic number, because the mean of its divisors is an integer number (55610610101109).

Almost surely, 2^{111221220202217} is an apocalyptic number.

It is an amenable number.

111221220202217 is a deficient number, since it is larger than the sum of its proper divisors (1).

111221220202217 is an equidigital number, since it uses as much as digits as its factorization.

111221220202217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 896, while the sum is 26.

Adding to 111221220202217 its reverse (712202022122111), we get a palindrome (823423242324328).

The spelling of 111221220202217 in words is "one hundred eleven trillion, two hundred twenty-one billion, two hundred twenty million, two hundred two thousand, two hundred seventeen".