216204403 has 2 divisors, whose sum is σ = 216204404. Its totient is φ = 216204402.

The previous prime is 216204397. The next prime is 216204413. The reversal of 216204403 is 304402612.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216204403 - 2⁹ = 216203891 is a prime.

It is not a weakly prime, because it can be changed into another prime (216204413) 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 as a sum of consecutive naturals, namely, 108102201 + 108102202.

It is an arithmetic number, because the mean of its divisors is an integer number (108102202).

Almost surely, 2^216204403 is an apocalyptic number.

216204403 is a deficient number, since it is larger than the sum of its proper divisors (1).

216204403 is an equidigital number, since it uses as much as digits as its factorization.

216204403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 216204403 is about 14703.8907436093. The cubic root of 216204403 is about 600.1892023682.

The spelling of 216204403 in words is "two hundred sixteen million, two hundred four thousand, four hundred three".