218211189 has 16 divisors (see below), whose sum is σ = 346970112. Its totient is φ = 119270448.

The previous prime is 218211137. The next prime is 218211211. The reversal of 218211189 is 981112812.

It is not a de Polignac number, because 218211189 - 2⁸ = 218210933 is a prime.

It is a super-2 number, since 2×218211189² = 95232246009587442, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218211289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 225409 + ... + 226374.

It is an arithmetic number, because the mean of its divisors is an integer number (21685632).

Almost surely, 2^218211189 is an apocalyptic number.

It is an amenable number.

218211189 is a deficient number, since it is larger than the sum of its proper divisors (128758923).

218211189 is a wasteful number, since it uses less digits than its factorization.

218211189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 451816.

The product of its digits is 2304, while the sum is 33.

The square root of 218211189 is about 14771.9730909584. The cubic root of 218211189 is about 602.0404502939.

The spelling of 218211189 in words is "two hundred eighteen million, two hundred eleven thousand, one hundred eighty-nine".