217215567217 has 48 divisors (see below), whose sum is σ = 253282518720. Its totient is φ = 185822017920.

The previous prime is 217215567209. The next prime is 217215567293. The reversal of 217215567217 is 712765512712.

It is not a de Polignac number, because 217215567217 - 2³ = 217215567209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (217215567917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 84948103 + ... + 84950659.

It is an arithmetic number, because the mean of its divisors is an integer number (5276719140).

Almost surely, 2^217215567217 is an apocalyptic number.

It is an amenable number.

217215567217 is a deficient number, since it is larger than the sum of its proper divisors (36066951503).

217215567217 is a wasteful number, since it uses less digits than its factorization.

217215567217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3214 (or 3203 counting only the distinct ones).

The product of its digits is 411600, while the sum is 46.

The spelling of 217215567217 in words is "two hundred seventeen billion, two hundred fifteen million, five hundred sixty-seven thousand, two hundred seventeen".