221343304 has 64 divisors (see below), whose sum is σ = 521740800. Its totient is φ = 85688064.

The previous prime is 221343301. The next prime is 221343307. The reversal of 221343304 is 403343122.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (221343301) and next prime (221343307).

It is a super-3 number, since 3×221343304³ (a number of 26 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (221343301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30982 + ... + 37450.

It is an arithmetic number, because the mean of its divisors is an integer number (8152200).

Almost surely, 2^221343304 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 221343304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (260870400).

221343304 is an abundant number, since it is smaller than the sum of its proper divisors (300397496).

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

221343304 is a wasteful number, since it uses less digits than its factorization.

221343304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6542 (or 6538 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 22.

The square root of 221343304 is about 14877.6108296998. The cubic root of 221343304 is about 604.9072589670.

Adding to 221343304 its reverse (403343122), we get a palindrome (624686426).

The spelling of 221343304 in words is "two hundred twenty-one million, three hundred forty-three thousand, three hundred four".