216424303 has 4 divisors (see below), whose sum is σ = 223887240. Its totient is φ = 208961368.

The previous prime is 216424277. The next prime is 216424309. The reversal of 216424303 is 303424612.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216424303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216424309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3731425 + ... + 3731482.

It is an arithmetic number, because the mean of its divisors is an integer number (55971810).

Almost surely, 2^216424303 is an apocalyptic number.

216424303 is a deficient number, since it is larger than the sum of its proper divisors (7462937).

216424303 is an equidigital number, since it uses as much as digits as its factorization.

216424303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7462936.

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 216424303 is about 14711.3664559075. The cubic root of 216424303 is about 600.3926161797.

Adding to 216424303 its reverse (303424612), we get a palindrome (519848915).

The spelling of 216424303 in words is "two hundred sixteen million, four hundred twenty-four thousand, three hundred three".