216218 has 4 divisors (see below), whose sum is σ = 324330. Its totient is φ = 108108.

The previous prime is 216217. The next prime is 216233. The reversal of 216218 is 812612.

216218 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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., 214369 + 1849 = 463^2 + 43^2 .

It is a Curzon number.

It is a nialpdrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 216218.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 216218.

It is not an unprimeable number, because it can be changed into a prime (216211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54053 + ... + 54056.

2²¹⁶²¹⁸ is an apocalyptic number.

216218 is a deficient number, since it is larger than the sum of its proper divisors (108112).

216218 is a wasteful number, since it uses less digits than its factorization.

216218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108111.

The product of its digits is 192, while the sum is 20.

The square root of 216218 is about 464.9924730574. The cubic root of 216218 is about 60.0201783983.

It can be divided in two parts, 216 and 218, that added together give a palindrome (434).

The spelling of 216218 in words is "two hundred sixteen thousand, two hundred eighteen".