216240203 has 4 divisors (see below), whose sum is σ = 216670608. Its totient is φ = 215809800.

The previous prime is 216240169. The next prime is 216240209. The reversal of 216240203 is 302042612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 216240203 - 2²⁴ = 199462987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216240209) 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, 214448 + ... + 215453.

It is an arithmetic number, because the mean of its divisors is an integer number (54167652).

Almost surely, 2^216240203 is an apocalyptic number.

216240203 is a deficient number, since it is larger than the sum of its proper divisors (430405).

216240203 is an equidigital number, since it uses as much as digits as its factorization.

216240203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430404.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 216240203 is about 14705.1080580865. The cubic root of 216240203 is about 600.2223277923. Note that the first 3 decimals are identical.

Adding to 216240203 its reverse (302042612), we get a palindrome (518282815).

The spelling of 216240203 in words is "two hundred sixteen million, two hundred forty thousand, two hundred three".