223443221 has 4 divisors (see below), whose sum is σ = 226135392. Its totient is φ = 220751052.

The previous prime is 223443203. The next prime is 223443247. The reversal of 223443221 is 122344322.

223443221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 122344322 = 2 ⋅61172161.

It is a cyclic number.

It is not a de Polignac number, because 223443221 - 2¹⁴ = 223426837 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (223443271) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1345961 + ... + 1346126.

It is an arithmetic number, because the mean of its divisors is an integer number (56533848).

Almost surely, 2^223443221 is an apocalyptic number.

It is an amenable number.

223443221 is a deficient number, since it is larger than the sum of its proper divisors (2692171).

223443221 is an equidigital number, since it uses as much as digits as its factorization.

223443221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2692170.

The product of its digits is 2304, while the sum is 23.

The square root of 223443221 is about 14948.0172932734. The cubic root of 223443221 is about 606.8141896939.

Adding to 223443221 its reverse (122344322), we get a palindrome (345787543).

The spelling of 223443221 in words is "two hundred twenty-three million, four hundred forty-three thousand, two hundred twenty-one".