221204204 has 48 divisors (see below), whose sum is σ = 453404448. Its totient is φ = 93477888.

The previous prime is 221204197. The next prime is 221204209. The reversal of 221204204 is 402402122.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is not an unprimeable number, because it can be changed into a prime (221204209) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 29327 + ... + 36089.

It is an arithmetic number, because the mean of its divisors is an integer number (9445926).

Almost surely, 2^221204204 is an apocalyptic number.

It is an amenable number.

221204204 is an abundant number, since it is smaller than the sum of its proper divisors (232200244).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221204204 is a wasteful number, since it uses less digits than its factorization.

221204204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6834 (or 6832 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 221204204 is about 14872.9352852757. The cubic root of 221204204 is about 604.7805173392.

Adding to 221204204 its reverse (402402122), we get a palindrome (623606326).

The spelling of 221204204 in words is "two hundred twenty-one million, two hundred four thousand, two hundred four".