221243204 has 48 divisors (see below), whose sum is σ = 492979200. Its totient is φ = 84502656.

The previous prime is 221243177. The next prime is 221243207. The reversal of 221243204 is 402342122.

It is not an unprimeable number, because it can be changed into a prime (221243207) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77 + ... + 21035.

It is an arithmetic number, because the mean of its divisors is an integer number (10270400).

Almost surely, 2^221243204 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221243204, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (246489600).

221243204 is an abundant number, since it is smaller than the sum of its proper divisors (271735996).

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

221243204 is a wasteful number, since it uses less digits than its factorization.

221243204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21012 (or 21010 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 221243204 is about 14874.2463338483. The cubic root of 221243204 is about 604.8160577339.

Adding to 221243204 its reverse (402342122), we get a palindrome (623585326).

The spelling of 221243204 in words is "two hundred twenty-one million, two hundred forty-three thousand, two hundred four".