218213113 has 2 divisors, whose sum is σ = 218213114. Its totient is φ = 218213112.

The previous prime is 218213077. The next prime is 218213117. The reversal of 218213113 is 311312812.

It is a happy number.

218213113 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., 201867264 + 16345849 = 14208^2 + 4043^2 .

It is a cyclic number.

It is not a de Polignac number, because 218213113 - 2⁹ = 218212601 is a prime.

It is not a weakly prime, because it can be changed into another prime (218213117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109106556 + 109106557.

It is an arithmetic number, because the mean of its divisors is an integer number (109106557).

Almost surely, 2^218213113 is an apocalyptic number.

It is an amenable number.

218213113 is a deficient number, since it is larger than the sum of its proper divisors (1).

218213113 is an equidigital number, since it uses as much as digits as its factorization.

218213113 is an evil number, because the sum of its binary digits is even.

The product of its digits is 288, while the sum is 22.

The square root of 218213113 is about 14772.0382141396. The cubic root of 218213113 is about 602.0422197149.

Adding to 218213113 its reverse (311312812), we get a palindrome (529525925).

The spelling of 218213113 in words is "two hundred eighteen million, two hundred thirteen thousand, one hundred thirteen".