216204211 has 4 divisors (see below), whose sum is σ = 227583400. Its totient is φ = 204825024.

The previous prime is 216204187. The next prime is 216204227. The reversal of 216204211 is 112402612.

216204211 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 216204211 - 2¹⁵ = 216171443 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 11379169 = 216204211 / (2 + 1 + 6 + 2 + 0 + 4 + 2 + 1 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216204271) 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, 5689566 + ... + 5689603.

It is an arithmetic number, because the mean of its divisors is an integer number (56895850).

Almost surely, 2^216204211 is an apocalyptic number.

216204211 is a deficient number, since it is larger than the sum of its proper divisors (11379189).

216204211 is a wasteful number, since it uses less digits than its factorization.

216204211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11379188.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 216204211 is about 14703.8842147237. The cubic root of 216204211 is about 600.1890247024.

Adding to 216204211 its reverse (112402612), we get a palindrome (328606823).

The spelling of 216204211 in words is "two hundred sixteen million, two hundred four thousand, two hundred eleven".