221444304 has 20 divisors (see below), whose sum is σ = 572064576. Its totient is φ = 73814752.

The previous prime is 221444303. The next prime is 221444317. The reversal of 221444304 is 403444122.

It is a happy number.

221444304 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221444303) 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, 2306664 + ... + 2306759.

Almost surely, 2^221444304 is an apocalyptic number.

221444304 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

221444304 is an abundant number, since it is smaller than the sum of its proper divisors (350620272).

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

221444304 is a wasteful number, since it uses less digits than its factorization.

221444304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4613434 (or 4613428 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 24.

The square root of 221444304 is about 14881.0048047838. The cubic root of 221444304 is about 604.9992523270. Note that the first 3 decimals are identical.

Adding to 221444304 its reverse (403444122), we get a palindrome (624888426).

The spelling of 221444304 in words is "two hundred twenty-one million, four hundred forty-four thousand, three hundred four".