255332221 has 2 divisors, whose sum is σ = 255332222. Its totient is φ = 255332220.

The previous prime is 255332219. The next prime is 255332249. The reversal of 255332221 is 122233552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 253605625 + 1726596 = 15925^2 + 1314^2 .

It is a cyclic number.

It is not a de Polignac number, because 255332221 - 2¹ = 255332219 is a prime.

Together with 255332219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255332251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127666110 + 127666111.

It is an arithmetic number, because the mean of its divisors is an integer number (127666111).

Almost surely, 2^255332221 is an apocalyptic number.

It is an amenable number.

255332221 is a deficient number, since it is larger than the sum of its proper divisors (1).

255332221 is an equidigital number, since it uses as much as digits as its factorization.

255332221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3600, while the sum is 25.

The square root of 255332221 is about 15979.1182798051. The cubic root of 255332221 is about 634.4078394706.

Adding to 255332221 its reverse (122233552), we get a palindrome (377565773).

The spelling of 255332221 in words is "two hundred fifty-five million, three hundred thirty-two thousand, two hundred twenty-one".