217237135217 has 2 divisors, whose sum is σ = 217237135218. Its totient is φ = 217237135216.

The previous prime is 217237135201. The next prime is 217237135253. The reversal of 217237135217 is 712531732712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 210322214881 + 6914920336 = 458609^2 + 83156^2 .

It is a cyclic number.

It is not a de Polignac number, because 217237135217 - 2⁴ = 217237135201 is a prime.

It is not a weakly prime, because it can be changed into another prime (217237155217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108618567608 + 108618567609.

It is an arithmetic number, because the mean of its divisors is an integer number (108618567609).

Almost surely, 2^217237135217 is an apocalyptic number.

It is an amenable number.

217237135217 is a deficient number, since it is larger than the sum of its proper divisors (1).

217237135217 is an equidigital number, since it uses as much as digits as its factorization.

217237135217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 123480, while the sum is 41.

Adding to 217237135217 its reverse (712531732712), we get a palindrome (929768867929).

The spelling of 217237135217 in words is "two hundred seventeen billion, two hundred thirty-seven million, one hundred thirty-five thousand, two hundred seventeen".