221220102217 has 2 divisors, whose sum is σ = 221220102218. Its totient is φ = 221220102216.

The previous prime is 221220102167. The next prime is 221220102251. The reversal of 221220102217 is 712201022122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 167329265481 + 53890836736 = 409059^2 + 232144^2 .

It is a cyclic number.

It is not a de Polignac number, because 221220102217 - 2²⁷ = 221085884489 is a prime.

It is not a weakly prime, because it can be changed into another prime (221220108217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110610051108 + 110610051109.

It is an arithmetic number, because the mean of its divisors is an integer number (110610051109).

Almost surely, 2^221220102217 is an apocalyptic number.

It is an amenable number.

221220102217 is a deficient number, since it is larger than the sum of its proper divisors (1).

221220102217 is an equidigital number, since it uses as much as digits as its factorization.

221220102217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 448, while the sum is 22.

Adding to 221220102217 its reverse (712201022122), we get a palindrome (933421124339).

The spelling of 221220102217 in words is "two hundred twenty-one billion, two hundred twenty million, one hundred two thousand, two hundred seventeen".