216244590209 has 4 divisors (see below), whose sum is σ = 216268035504. Its totient is φ = 216221144916.

The previous prime is 216244590193. The next prime is 216244590217. The reversal of 216244590209 is 902095442612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 216244590209 - 2⁴ = 216244590193 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 216244590209.

It is not an unprimeable number, because it can be changed into a prime (216244590239) 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 3 ways as a sum of consecutive naturals, for example, 11708807 + ... + 11727260.

It is an arithmetic number, because the mean of its divisors is an integer number (54067008876).

Almost surely, 2^216244590209 is an apocalyptic number.

It is an amenable number.

216244590209 is a deficient number, since it is larger than the sum of its proper divisors (23445295).

216244590209 is an equidigital number, since it uses as much as digits as its factorization.

216244590209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23445294.

The product of its (nonzero) digits is 311040, while the sum is 44.

The spelling of 216244590209 in words is "two hundred sixteen billion, two hundred forty-four million, five hundred ninety thousand, two hundred nine".