201818212 has 12 divisors (see below), whose sum is σ = 353281516. Its totient is φ = 100880640.

The previous prime is 201818189. The next prime is 201818213. The reversal of 201818212 is 212818102.

It can be written as a sum of positive squares in 2 ways, for example, as 23755876 + 178062336 = 4874^2 + 13344^2 .

It is not an unprimeable number, because it can be changed into a prime (201818213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22912 + ... + 30472.

Almost surely, 2^201818212 is an apocalyptic number.

It is an amenable number.

201818212 is a deficient number, since it is larger than the sum of its proper divisors (151463304).

201818212 is a wasteful number, since it uses less digits than its factorization.

201818212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14238 (or 14236 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 25.

The square root of 201818212 is about 14206.2736845381. The cubic root of 201818212 is about 586.5703657071.

The spelling of 201818212 in words is "two hundred one million, eight hundred eighteen thousand, two hundred twelve".