218116211 has 2 divisors, whose sum is σ = 218116212. Its totient is φ = 218116210.

The previous prime is 218116201. The next prime is 218116243. The reversal of 218116211 is 112611812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 218116211 - 2¹⁸ = 217854067 is a prime.

It is not a weakly prime, because it can be changed into another prime (218116201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109058105 + 109058106.

It is an arithmetic number, because the mean of its divisors is an integer number (109058106).

Almost surely, 2^218116211 is an apocalyptic number.

218116211 is a deficient number, since it is larger than the sum of its proper divisors (1).

218116211 is an equidigital number, since it uses as much as digits as its factorization.

218116211 is an evil number, because the sum of its binary digits is even.

The product of its digits is 192, while the sum is 23.

The square root of 218116211 is about 14768.7579369424. The cubic root of 218116211 is about 601.9530901296.

The spelling of 218116211 in words is "two hundred eighteen million, one hundred sixteen thousand, two hundred eleven".