221383228 has 24 divisors (see below), whose sum is σ = 427397040. Its totient is φ = 99496320.

The previous prime is 221383223. The next prime is 221383229. The reversal of 221383228 is 822383122.

221383228 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 221383228.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221383223) 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, 24351 + ... + 32182.

It is an arithmetic number, because the mean of its divisors is an integer number (17808210).

Almost surely, 2^221383228 is an apocalyptic number.

It is an amenable number.

221383228 is a deficient number, since it is larger than the sum of its proper divisors (206013812).

221383228 is a wasteful number, since it uses less digits than its factorization.

221383228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56637 (or 56635 counting only the distinct ones).

The product of its digits is 9216, while the sum is 31.

The square root of 221383228 is about 14878.9525168945. The cubic root of 221383228 is about 604.9436261021.

The spelling of 221383228 in words is "two hundred twenty-one million, three hundred eighty-three thousand, two hundred twenty-eight".