216305233 has 4 divisors (see below), whose sum is σ = 220907520. Its totient is φ = 211702948.

The previous prime is 216305227. The next prime is 216305249. The reversal of 216305233 is 332503612.

It is a happy number.

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-216305233 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 216305198 and 216305207.

It is not an unprimeable number, because it can be changed into a prime (216305203) 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 3 ways as a sum of consecutive naturals, for example, 2301073 + ... + 2301166.

It is an arithmetic number, because the mean of its divisors is an integer number (55226880).

Almost surely, 2^216305233 is an apocalyptic number.

It is an amenable number.

216305233 is a deficient number, since it is larger than the sum of its proper divisors (4602287).

216305233 is an equidigital number, since it uses as much as digits as its factorization.

216305233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4602286.

The product of its (nonzero) digits is 3240, while the sum is 25.

The square root of 216305233 is about 14707.3190282934. The cubic root of 216305233 is about 600.2824901262.

Adding to 216305233 its reverse (332503612), we get a palindrome (548808845).

The spelling of 216305233 in words is "two hundred sixteen million, three hundred five thousand, two hundred thirty-three".