221225304 has 16 divisors (see below), whose sum is σ = 553063320. Its totient is φ = 73741760.

The previous prime is 221225209. The next prime is 221225309. The reversal of 221225304 is 403522122.

221225304 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221225309) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4608837 + ... + 4608884.

Almost surely, 2^221225304 is an apocalyptic number.

221225304 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

221225304 is an abundant number, since it is smaller than the sum of its proper divisors (331838016).

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

221225304 is a wasteful number, since it uses less digits than its factorization.

221225304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9217730 (or 9217726 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 221225304 is about 14873.6446105183. The cubic root of 221225304 is about 604.7997461226.

Adding to 221225304 its reverse (403522122), we get a palindrome (624747426).

The spelling of 221225304 in words is "two hundred twenty-one million, two hundred twenty-five thousand, three hundred four".