256223321 has 2 divisors, whose sum is σ = 256223322. Its totient is φ = 256223320.

The previous prime is 256223311. The next prime is 256223333. The reversal of 256223321 is 123322652.

256223321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 149328400 + 106894921 = 12220^2 + 10339^2 .

It is a cyclic number.

It is not a de Polignac number, because 256223321 - 2¹⁰ = 256222297 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (256223311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128111660 + 128111661.

It is an arithmetic number, because the mean of its divisors is an integer number (128111661).

Almost surely, 2^256223321 is an apocalyptic number.

It is an amenable number.

256223321 is a deficient number, since it is larger than the sum of its proper divisors (1).

256223321 is an equidigital number, since it uses as much as digits as its factorization.

256223321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 26.

The square root of 256223321 is about 16006.9772599326. The cubic root of 256223321 is about 635.1450025362.

Adding to 256223321 its reverse (123322652), we get a palindrome (379545973).

The spelling of 256223321 in words is "two hundred fifty-six million, two hundred twenty-three thousand, three hundred twenty-one".