216505033 has 2 divisors, whose sum is σ = 216505034. Its totient is φ = 216505032.

The previous prime is 216505021. The next prime is 216505061. The reversal of 216505033 is 330505612.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 119836809 + 96668224 = 10947^2 + 9832^2 .

It is a cyclic number.

It is not a de Polignac number, because 216505033 - 2⁹ = 216504521 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 216504989 and 216505007.

It is not a weakly prime, because it can be changed into another prime (216505733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108252516 + 108252517.

It is an arithmetic number, because the mean of its divisors is an integer number (108252517).

Almost surely, 2^216505033 is an apocalyptic number.

It is an amenable number.

216505033 is a deficient number, since it is larger than the sum of its proper divisors (1).

216505033 is an equidigital number, since it uses as much as digits as its factorization.

216505033 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2700, while the sum is 25.

The square root of 216505033 is about 14714.1099968704. The cubic root of 216505033 is about 600.4672591685.

The spelling of 216505033 in words is "two hundred sixteen million, five hundred five thousand, thirty-three".