255086021 has 2 divisors, whose sum is σ = 255086022. Its totient is φ = 255086020.

The previous prime is 255086009. The next prime is 255086053. The reversal of 255086021 is 120680552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 195580225 + 59505796 = 13985^2 + 7714^2 .

It is a cyclic number.

It is not a de Polignac number, because 255086021 - 2¹⁰ = 255084997 is a prime.

It is a super-2 number, since 2×255086021² = 130137756219224882, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255085021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127543010 + 127543011.

It is an arithmetic number, because the mean of its divisors is an integer number (127543011).

Almost surely, 2^255086021 is an apocalyptic number.

It is an amenable number.

255086021 is a deficient number, since it is larger than the sum of its proper divisors (1).

255086021 is an equidigital number, since it uses as much as digits as its factorization.

255086021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 255086021 is about 15971.4126175489. The cubic root of 255086021 is about 634.2038680355.

The spelling of 255086021 in words is "two hundred fifty-five million, eighty-six thousand, twenty-one".