221040320 has 56 divisors (see below), whose sum is σ = 544525200. Its totient is φ = 85363712.

The previous prime is 221040301. The next prime is 221040353. The reversal of 221040320 is 23040122.

221040320 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 221040295 and 221040304.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2630 + ... + 21189.

Almost surely, 2^221040320 is an apocalyptic number.

221040320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221040320 is an abundant number, since it is smaller than the sum of its proper divisors (323484880).

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

221040320 is a wasteful number, since it uses less digits than its factorization.

221040320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23865 (or 23855 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 221040320 is about 14867.4247938236. The cubic root of 221040320 is about 604.6311254568.

Adding to 221040320 its reverse (23040122), we get a palindrome (244080442).

The spelling of 221040320 in words is "two hundred twenty-one million, forty thousand, three hundred twenty".