217384381868 has 24 divisors (see below), whose sum is σ = 393291848544. Its totient is φ = 105054192000.

The previous prime is 217384381861. The next prime is 217384381889. The reversal of 217384381868 is 868183483712.

It is not an unprimeable number, because it can be changed into a prime (217384381861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4841273 + ... + 4885968.

It is an arithmetic number, because the mean of its divisors is an integer number (16387160356).

Almost surely, 2^217384381868 is an apocalyptic number.

It is an amenable number.

217384381868 is a deficient number, since it is larger than the sum of its proper divisors (175907466676).

217384381868 is a wasteful number, since it uses less digits than its factorization.

217384381868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9727433 (or 9727431 counting only the distinct ones).

The product of its digits is 12386304, while the sum is 59.

The spelling of 217384381868 in words is "two hundred seventeen billion, three hundred eighty-four million, three hundred eighty-one thousand, eight hundred sixty-eight".