224403221 has 4 divisors (see below), whose sum is σ = 256460832. Its totient is φ = 192345612.

The previous prime is 224403181. The next prime is 224403227. The reversal of 224403221 is 122304422.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 224403221 - 2¹⁸ = 224141077 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 224403193 and 224403202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (224403227) 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 3 ways as a sum of consecutive naturals, for example, 16028795 + ... + 16028808.

It is an arithmetic number, because the mean of its divisors is an integer number (64115208).

Almost surely, 2^224403221 is an apocalyptic number.

It is an amenable number.

224403221 is a deficient number, since it is larger than the sum of its proper divisors (32057611).

224403221 is an equidigital number, since it uses as much as digits as its factorization.

224403221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32057610.

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 224403221 is about 14980.0941585826. The cubic root of 224403221 is about 607.6819855917.

Adding to 224403221 its reverse (122304422), we get a palindrome (346707643).

The spelling of 224403221 in words is "two hundred twenty-four million, four hundred three thousand, two hundred twenty-one".