216700217 has 2 divisors, whose sum is σ = 216700218. Its totient is φ = 216700216.

The previous prime is 216700201. The next prime is 216700219. The reversal of 216700217 is 712007612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 169104016 + 47596201 = 13004^2 + 6899^2 .

It is a cyclic number.

It is not a de Polignac number, because 216700217 - 2⁴ = 216700201 is a prime.

Together with 216700219, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (216700219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108350108 + 108350109.

It is an arithmetic number, because the mean of its divisors is an integer number (108350109).

Almost surely, 2^216700217 is an apocalyptic number.

It is an amenable number.

216700217 is a deficient number, since it is larger than the sum of its proper divisors (1).

216700217 is an equidigital number, since it uses as much as digits as its factorization.

216700217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1176, while the sum is 26.

The square root of 216700217 is about 14720.7410479228. The cubic root of 216700217 is about 600.6476497389.

Adding to 216700217 its reverse (712007612), we get a palindrome (928707829).

The spelling of 216700217 in words is "two hundred sixteen million, seven hundred thousand, two hundred seventeen".