218216 has 8 divisors (see below), whose sum is σ = 409170. Its totient is φ = 109104.

The previous prime is 218213. The next prime is 218227. The reversal of 218216 is 612812.

It can be written as a sum of positive squares in only one way, i.e., 206116 + 12100 = 454^2 + 110^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 218216.

It is not an unprimeable number, because it can be changed into a prime (218213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13631 + ... + 13646.

2²¹⁸²¹⁶ is an apocalyptic number.

It is an amenable number.

218216 is a deficient number, since it is larger than the sum of its proper divisors (190954).

218216 is a wasteful number, since it uses less digits than its factorization.

218216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27283 (or 27279 counting only the distinct ones).

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

The square root of 218216 is about 467.1359545143. The cubic root of 218216 is about 60.2044874747.

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

The spelling of 218216 in words is "two hundred eighteen thousand, two hundred sixteen".