223321221 has 6 divisors (see below), whose sum is σ = 322575110. Its totient is φ = 148880808.

The previous prime is 223321207. The next prime is 223321279. The reversal of 223321221 is 122123322.

It can be written as a sum of positive squares in only one way, i.e., 144360225 + 78960996 = 12015^2 + 8886^2 .

It is not a de Polignac number, because 223321221 - 2⁷ = 223321093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 223321194 and 223321203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (223321291) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12406726 + ... + 12406743.

Almost surely, 2^223321221 is an apocalyptic number.

It is an amenable number.

223321221 is a deficient number, since it is larger than the sum of its proper divisors (99253889).

223321221 is a wasteful number, since it uses less digits than its factorization.

223321221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24813475 (or 24813472 counting only the distinct ones).

The product of its digits is 288, while the sum is 18.

The square root of 223321221 is about 14943.9359273252. The cubic root of 223321221 is about 606.7037294039.

Adding to 223321221 its reverse (122123322), we get a palindrome (345444543).

The spelling of 223321221 in words is "two hundred twenty-three million, three hundred twenty-one thousand, two hundred twenty-one".