216205403 has 4 divisors (see below), whose sum is σ = 216400080. Its totient is φ = 216010728.

The previous prime is 216205369. The next prime is 216205417. The reversal of 216205403 is 304502612.

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 216205403 - 2⁸ = 216205147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216205453) 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, 95663 + ... + 97896.

It is an arithmetic number, because the mean of its divisors is an integer number (54100020).

Almost surely, 2^216205403 is an apocalyptic number.

216205403 is a deficient number, since it is larger than the sum of its proper divisors (194677).

216205403 is a wasteful number, since it uses less digits than its factorization.

216205403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194676.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 216205403 is about 14703.9247481752. The cubic root of 216205403 is about 600.1901277090.

The spelling of 216205403 in words is "two hundred sixteen million, two hundred five thousand, four hundred three".