221824328 has 32 divisors (see below), whose sum is σ = 473463360. Its totient is φ = 96444480.

The previous prime is 221824327. The next prime is 221824367. The reversal of 221824328 is 823428122.

It is a junction number, because it is equal to n+sod(n) for n = 221824294 and 221824303.

It is not an unprimeable number, because it can be changed into a prime (221824321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52775 + ... + 56822.

It is an arithmetic number, because the mean of its divisors is an integer number (14795730).

Almost surely, 2^221824328 is an apocalyptic number.

It is an amenable number.

221824328 is an abundant number, since it is smaller than the sum of its proper divisors (251639032).

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

221824328 is a wasteful number, since it uses less digits than its factorization.

221824328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109637 (or 109633 counting only the distinct ones).

The product of its digits is 12288, while the sum is 32.

The square root of 221824328 is about 14893.7680927293. The cubic root of 221824328 is about 605.3451374054.

The spelling of 221824328 in words is "two hundred twenty-one million, eight hundred twenty-four thousand, three hundred twenty-eight".