217384399993 has 2 divisors, whose sum is σ = 217384399994. Its totient is φ = 217384399992.

The previous prime is 217384399987. The next prime is 217384400011. The reversal of 217384399993 is 399993483712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 124137838224 + 93246561769 = 352332^2 + 305363^2 .

It is a cyclic number.

It is not a de Polignac number, because 217384399993 - 2⁹ = 217384399481 is a prime.

It is not a weakly prime, because it can be changed into another prime (217384399963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108692199996 + 108692199997.

It is an arithmetic number, because the mean of its divisors is an integer number (108692199997).

Almost surely, 2^217384399993 is an apocalyptic number.

It is an amenable number.

217384399993 is a deficient number, since it is larger than the sum of its proper divisors (1).

217384399993 is an equidigital number, since it uses as much as digits as its factorization.

217384399993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 79361856, while the sum is 67.

The spelling of 217384399993 in words is "two hundred seventeen billion, three hundred eighty-four million, three hundred ninety-nine thousand, nine hundred ninety-three".