223421321 has 4 divisors (see below), whose sum is σ = 225180672. Its totient is φ = 221661972.

The previous prime is 223421311. The next prime is 223421339. The reversal of 223421321 is 123124322.

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: 123124322 = 2 ⋅61562161.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-223421321 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 223421293 and 223421302.

It is not an unprimeable number, because it can be changed into a prime (223421311) 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, 879485 + ... + 879738.

It is an arithmetic number, because the mean of its divisors is an integer number (56295168).

Almost surely, 2^223421321 is an apocalyptic number.

It is an amenable number.

223421321 is a deficient number, since it is larger than the sum of its proper divisors (1759351).

223421321 is a wasteful number, since it uses less digits than its factorization.

223421321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1759350.

The product of its digits is 576, while the sum is 20.

The square root of 223421321 is about 14947.2847367005. The cubic root of 223421321 is about 606.7943641279.

Adding to 223421321 its reverse (123124322), we get a palindrome (346545643).

The spelling of 223421321 in words is "two hundred twenty-three million, four hundred twenty-one thousand, three hundred twenty-one".