1222221222217 has 2 divisors, whose sum is σ = 1222221222218. Its totient is φ = 1222221222216.

The previous prime is 1222221222163. The next prime is 1222221222253. The reversal of 1222221222217 is 7122221222221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 853931239056 + 368289983161 = 924084^2 + 606869^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1222221222217 is a prime.

It is not a weakly prime, because it can be changed into another prime (1222221292217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611110611108 + 611110611109.

It is an arithmetic number, because the mean of its divisors is an integer number (611110611109).

Almost surely, 2^{1222221222217} is an apocalyptic number.

It is an amenable number.

1222221222217 is a deficient number, since it is larger than the sum of its proper divisors (1).

1222221222217 is an equidigital number, since it uses as much as digits as its factorization.

1222221222217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3584, while the sum is 28.

Adding to 1222221222217 its reverse (7122221222221), we get a palindrome (8344442444438).

The spelling of 1222221222217 in words is "one trillion, two hundred twenty-two billion, two hundred twenty-one million, two hundred twenty-two thousand, two hundred seventeen".