221100204 has 24 divisors (see below), whose sum is σ = 555585520. Its totient is φ = 68030784.

The previous prime is 221100203. The next prime is 221100227. The reversal of 221100204 is 402001122.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a self number, because there is not a number n which added to its sum of digits gives 221100204.

It is not an unprimeable number, because it can be changed into a prime (221100203) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 708499 + ... + 708810.

Almost surely, 2^221100204 is an apocalyptic number.

It is an amenable number.

221100204 is an abundant number, since it is smaller than the sum of its proper divisors (334485316).

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

221100204 is a wasteful number, since it uses less digits than its factorization.

221100204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1417329 (or 1417327 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 221100204 is about 14869.4385906126. The cubic root of 221100204 is about 604.6857225261.

Adding to 221100204 its reverse (402001122), we get a palindrome (623101326).

The spelling of 221100204 in words is "two hundred twenty-one million, one hundred thousand, two hundred four".