216533243 has 2 divisors, whose sum is σ = 216533244. Its totient is φ = 216533242.

The previous prime is 216533231. The next prime is 216533281. The reversal of 216533243 is 342335612.

216533243 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216533243 - 2⁶ = 216533179 is a prime.

It is not a weakly prime, because it can be changed into another prime (216533203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108266621 + 108266622.

It is an arithmetic number, because the mean of its divisors is an integer number (108266622).

Almost surely, 2^216533243 is an apocalyptic number.

216533243 is a deficient number, since it is larger than the sum of its proper divisors (1).

216533243 is an equidigital number, since it uses as much as digits as its factorization.

216533243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 29.

The square root of 216533243 is about 14715.0685693272. The cubic root of 216533243 is about 600.4933377704.

Adding to 216533243 its reverse (342335612), we get a palindrome (558868855).

The spelling of 216533243 in words is "two hundred sixteen million, five hundred thirty-three thousand, two hundred forty-three".