221304330 has 48 divisors (see below), whose sum is σ = 619655400. Its totient is φ = 54474624.

The previous prime is 221304329. The next prime is 221304331. The reversal of 221304330 is 33403122.

It is an interprime number because it is at equal distance from previous prime (221304329) and next prime (221304331).

It can be written as a sum of positive squares in 4 ways, for example, as 129891609 + 91412721 = 11397^2 + 9561^2 .

It is a super-3 number, since 3×221304330³ (a number of 26 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (221304331) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 93405 + ... + 95744.

Almost surely, 2^221304330 is an apocalyptic number.

221304330 is an abundant number, since it is smaller than the sum of its proper divisors (398351070).

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

221304330 is a wasteful number, since it uses less digits than its factorization.

221304330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189175 (or 189172 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

The square root of 221304330 is about 14876.3009515135. The cubic root of 221304330 is about 604.8717529770.

Adding to 221304330 its reverse (33403122), we get a palindrome (254707452).

The spelling of 221304330 in words is "two hundred twenty-one million, three hundred four thousand, three hundred thirty".