221320330 has 64 divisors (see below), whose sum is σ = 502806528. Its totient is φ = 68132160.

The previous prime is 221320313. The next prime is 221320339. The reversal of 221320330 is 33023122.

It is not an unprimeable number, because it can be changed into a prime (221320339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 62179 + ... + 65641.

It is an arithmetic number, because the mean of its divisors is an integer number (7856352).

Almost surely, 2^221320330 is an apocalyptic number.

221320330 is an abundant number, since it is smaller than the sum of its proper divisors (281486198).

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

221320330 is a wasteful number, since it uses less digits than its factorization.

221320330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3571.

The product of its (nonzero) digits is 216, while the sum is 16.

The square root of 221320330 is about 14876.8387098873. The cubic root of 221320330 is about 604.8863297589.

Adding to 221320330 its reverse (33023122), we get a palindrome (254343452).

The spelling of 221320330 in words is "two hundred twenty-one million, three hundred twenty thousand, three hundred thirty".