218213 has 2 divisors, whose sum is σ = 218214. Its totient is φ = 218212.

The previous prime is 218191. The next prime is 218227. The reversal of 218213 is 312812.

218213 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 214369 + 3844 = 463^2 + 62^2 .

It is a cyclic number.

It is not a de Polignac number, because 218213 - 2⁶ = 218149 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 218191 and 218200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (218233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109106 + 109107.

It is an arithmetic number, because the mean of its divisors is an integer number (109107).

2²¹⁸²¹³ is an apocalyptic number.

It is an amenable number.

218213 is a deficient number, since it is larger than the sum of its proper divisors (1).

218213 is an equidigital number, since it uses as much as digits as its factorization.

218213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96, while the sum is 17.

The square root of 218213 is about 467.1327434467. The cubic root of 218213 is about 60.2042115794.

The spelling of 218213 in words is "two hundred eighteen thousand, two hundred thirteen".