216343211 has 4 divisors (see below), whose sum is σ = 247249392. Its totient is φ = 185437032.

The previous prime is 216343187. The next prime is 216343223. The reversal of 216343211 is 112343612.

216343211 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 216343211 - 2²² = 212148907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216343261) 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, 15453080 + ... + 15453093.

It is an arithmetic number, because the mean of its divisors is an integer number (61812348).

Almost surely, 2^216343211 is an apocalyptic number.

216343211 is a deficient number, since it is larger than the sum of its proper divisors (30906181).

216343211 is an equidigital number, since it uses as much as digits as its factorization.

216343211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30906180.

The product of its digits is 864, while the sum is 23.

The square root of 216343211 is about 14708.6100974905. The cubic root of 216343211 is about 600.3176197961.

Adding to 216343211 its reverse (112343612), we get a palindrome (328686823).

It can be divided in two parts, 216 and 343211, that multiplied together give a triangular number (74133576 = T₁₂₁₇₆).

The spelling of 216343211 in words is "two hundred sixteen million, three hundred forty-three thousand, two hundred eleven".