255028021 has 2 divisors, whose sum is σ = 255028022. Its totient is φ = 255028020.

The previous prime is 255028003. The next prime is 255028043. The reversal of 255028021 is 120820552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 254243025 + 784996 = 15945^2 + 886^2 .

It is a cyclic number.

It is not a de Polignac number, because 255028021 - 2⁵ = 255027989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255028321) 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, 127514010 + 127514011.

It is an arithmetic number, because the mean of its divisors is an integer number (127514011).

Almost surely, 2^255028021 is an apocalyptic number.

It is an amenable number.

255028021 is a deficient number, since it is larger than the sum of its proper divisors (1).

255028021 is an equidigital number, since it uses as much as digits as its factorization.

255028021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1600, while the sum is 25.

The square root of 255028021 is about 15969.5967701129. The cubic root of 255028021 is about 634.1557971763.

Adding to 255028021 its reverse (120820552), we get a palindrome (375848573).

The spelling of 255028021 in words is "two hundred fifty-five million, twenty-eight thousand, twenty-one".