221206204 has 12 divisors (see below), whose sum is σ = 399598528. Its totient is φ = 107035200.

The previous prime is 221206169. The next prime is 221206213. The reversal of 221206204 is 402602122.

221206204 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 891837 + ... + 892084.

Almost surely, 2^221206204 is an apocalyptic number.

It is an amenable number.

221206204 is a deficient number, since it is larger than the sum of its proper divisors (178392324).

221206204 is a wasteful number, since it uses less digits than its factorization.

221206204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1783956 (or 1783954 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 221206204 is about 14873.0025213472. The cubic root of 221206204 is about 604.7823400252.

Adding to 221206204 its reverse (402602122), we get a palindrome (623808326).

The spelling of 221206204 in words is "two hundred twenty-one million, two hundred six thousand, two hundred four".