223421221 has 4 divisors (see below), whose sum is σ = 228174912. Its totient is φ = 218667532.

The previous prime is 223421189. The next prime is 223421251. The reversal of 223421221 is 122124322.

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 223421221 - 2⁵ = 223421189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (223421251) 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, 2376775 + ... + 2376868.

It is an arithmetic number, because the mean of its divisors is an integer number (57043728).

Almost surely, 2^223421221 is an apocalyptic number.

It is an amenable number.

223421221 is a deficient number, since it is larger than the sum of its proper divisors (4753691).

223421221 is an equidigital number, since it uses as much as digits as its factorization.

223421221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4753690.

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

The square root of 223421221 is about 14947.2813916110. The cubic root of 223421221 is about 606.7942735972.

Adding to 223421221 its reverse (122124322), we get a palindrome (345545543).

It can be divided in two parts, 22 and 3421221, that added together give a palindrome (3421243).

The spelling of 223421221 in words is "two hundred twenty-three million, four hundred twenty-one thousand, two hundred twenty-one".