216710217 has 12 divisors (see below), whose sum is σ = 315100864. Its totient is φ = 143515800.

The previous prime is 216710213. The next prime is 216710231. The reversal of 216710217 is 712017612.

It is not a de Polignac number, because 216710217 - 2² = 216710213 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216710213) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 78373 + ... + 81090.

Almost surely, 2^216710217 is an apocalyptic number.

It is an amenable number.

216710217 is a deficient number, since it is larger than the sum of its proper divisors (98390647).

216710217 is a wasteful number, since it uses less digits than its factorization.

216710217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159620 (or 159617 counting only the distinct ones).

The product of its (nonzero) digits is 1176, while the sum is 27.

The square root of 216710217 is about 14721.0807008181. The cubic root of 216710217 is about 600.6568888992.

Adding to 216710217 its reverse (712017612), we get a palindrome (928727829).

The spelling of 216710217 in words is "two hundred sixteen million, seven hundred ten thousand, two hundred seventeen".