223216321 has 2 divisors, whose sum is σ = 223216322. Its totient is φ = 223216320.

The previous prime is 223216289. The next prime is 223216333. The reversal of 223216321 is 123612322.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 217267600 + 5948721 = 14740^2 + 2439^2 .

It is a cyclic number.

It is not a de Polignac number, because 223216321 - 2⁵ = 223216289 is a prime.

It is a super-3 number, since 3×223216321³ (a number of 26 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 223216292 and 223216301.

It is not a weakly prime, because it can be changed into another prime (223216391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111608160 + 111608161.

It is an arithmetic number, because the mean of its divisors is an integer number (111608161).

Almost surely, 2^223216321 is an apocalyptic number.

It is an amenable number.

223216321 is a deficient number, since it is larger than the sum of its proper divisors (1).

223216321 is an equidigital number, since it uses as much as digits as its factorization.

223216321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 22.

The square root of 223216321 is about 14940.4257302126. The cubic root of 223216321 is about 606.6087194917.

Adding to 223216321 its reverse (123612322), we get a palindrome (346828643).

The spelling of 223216321 in words is "two hundred twenty-three million, two hundred sixteen thousand, three hundred twenty-one".