216203903 has 4 divisors (see below), whose sum is σ = 223659240. Its totient is φ = 208748568.

The previous prime is 216203899. The next prime is 216203927. The reversal of 216203903 is 309302612.

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 216203903 - 2² = 216203899 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 (216203993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3727625 + ... + 3727682.

It is an arithmetic number, because the mean of its divisors is an integer number (55914810).

Almost surely, 2^216203903 is an apocalyptic number.

216203903 is a deficient number, since it is larger than the sum of its proper divisors (7455337).

216203903 is an equidigital number, since it uses as much as digits as its factorization.

216203903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7455336.

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 216203903 is about 14703.8737412969. The cubic root of 216203903 is about 600.1887396967.

The spelling of 216203903 in words is "two hundred sixteen million, two hundred three thousand, nine hundred three".