216503033 has 2 divisors, whose sum is σ = 216503034. Its totient is φ = 216503032.

The previous prime is 216503029. The next prime is 216503047. The reversal of 216503033 is 330305612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 178409449 + 38093584 = 13357^2 + 6172^2 .

It is a cyclic number.

It is not a de Polignac number, because 216503033 - 2² = 216503029 is a prime.

It is not a weakly prime, because it can be changed into another prime (216503333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108251516 + 108251517.

It is an arithmetic number, because the mean of its divisors is an integer number (108251517).

Almost surely, 2^216503033 is an apocalyptic number.

It is an amenable number.

216503033 is a deficient number, since it is larger than the sum of its proper divisors (1).

216503033 is an equidigital number, since it uses as much as digits as its factorization.

216503033 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1620, while the sum is 23.

The square root of 216503033 is about 14714.0420347368. The cubic root of 216503033 is about 600.4654101919.

Adding to 216503033 its reverse (330305612), we get a palindrome (546808645).

The spelling of 216503033 in words is "two hundred sixteen million, five hundred three thousand, thirty-three".