217384399994 has 4 divisors (see below), whose sum is σ = 326076599994. Its totient is φ = 108692199996.

The previous prime is 217384399993. The next prime is 217384400011. The reversal of 217384399994 is 499993483712.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 143555358769 + 73829041225 = 378887^2 + 271715^2 .

It is not an unprimeable number, because it can be changed into a prime (217384399993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54346099997 + ... + 54346100000.

Almost surely, 2^217384399994 is an apocalyptic number.

217384399994 is a deficient number, since it is larger than the sum of its proper divisors (108692200000).

217384399994 is a wasteful number, since it uses less digits than its factorization.

217384399994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108692199999.

The product of its digits is 105815808, while the sum is 68.

The spelling of 217384399994 in words is "two hundred seventeen billion, three hundred eighty-four million, three hundred ninety-nine thousand, nine hundred ninety-four".