216343213 has 4 divisors (see below), whose sum is σ = 216678240. Its totient is φ = 216008188.

The previous prime is 216343187. The next prime is 216343223. The reversal of 216343213 is 312343612.

216343213 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216343213 is a prime.

It is a super-2 number, since 2×216343213² = 93608771622326738, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216343223) 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, 166543 + ... + 167836.

It is an arithmetic number, because the mean of its divisors is an integer number (54169560).

Almost surely, 2^216343213 is an apocalyptic number.

It is an amenable number.

216343213 is a deficient number, since it is larger than the sum of its proper divisors (335027).

216343213 is an equidigital number, since it uses as much as digits as its factorization.

216343213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335026.

The product of its digits is 2592, while the sum is 25.

The square root of 216343213 is about 14708.6101654779. The cubic root of 216343213 is about 600.3176216460.

Adding to 216343213 its reverse (312343612), we get a palindrome (528686825).

The spelling of 216343213 in words is "two hundred sixteen million, three hundred forty-three thousand, two hundred thirteen".