221124304 has 80 divisors (see below), whose sum is σ = 475750800. Its totient is φ = 99434496.

The previous prime is 221124289. The next prime is 221124307. The reversal of 221124304 is 403421122.

It can be written as a sum of positive squares in 8 ways, for example, as 304704 + 220819600 = 552^2 + 14860^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221124307) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 2279584 + ... + 2279680.

It is an arithmetic number, because the mean of its divisors is an integer number (5946885).

Almost surely, 2^221124304 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221124304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (237875400).

221124304 is an abundant number, since it is smaller than the sum of its proper divisors (254626496).

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

221124304 is an equidigital number, since it uses as much as digits as its factorization.

221124304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185 (or 145 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 221124304 is about 14870.2489555488. The cubic root of 221124304 is about 604.7076920467.

Adding to 221124304 its reverse (403421122), we get a palindrome (624545426).

The spelling of 221124304 in words is "two hundred twenty-one million, one hundred twenty-four thousand, three hundred four".