216857343211 has 2 divisors, whose sum is σ = 216857343212. Its totient is φ = 216857343210.

The previous prime is 216857343179. The next prime is 216857343251. The reversal of 216857343211 is 112343758612.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216857343211 - 2⁵ = 216857343179 is a prime.

It is not a weakly prime, because it can be changed into another prime (216857343251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108428671605 + 108428671606.

It is an arithmetic number, because the mean of its divisors is an integer number (108428671606).

Almost surely, 2^216857343211 is an apocalyptic number.

216857343211 is a deficient number, since it is larger than the sum of its proper divisors (1).

216857343211 is an equidigital number, since it uses as much as digits as its factorization.

216857343211 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 241920, while the sum is 43.

The spelling of 216857343211 in words is "two hundred sixteen billion, eight hundred fifty-seven million, three hundred forty-three thousand, two hundred eleven".