255085021 has 2 divisors, whose sum is σ = 255085022. Its totient is φ = 255085020.

The previous prime is 255085009. The next prime is 255085049. The reversal of 255085021 is 120580552.

It is an a-pointer prime, because the next prime (255085049) can be obtained adding 255085021 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 134304921 + 120780100 = 11589^2 + 10990^2 .

It is a cyclic number.

It is not a de Polignac number, because 255085021 - 2⁹ = 255084509 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255085001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127542510 + 127542511.

It is an arithmetic number, because the mean of its divisors is an integer number (127542511).

Almost surely, 2^255085021 is an apocalyptic number.

It is an amenable number.

255085021 is a deficient number, since it is larger than the sum of its proper divisors (1).

255085021 is an equidigital number, since it uses as much as digits as its factorization.

255085021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4000, while the sum is 28.

The square root of 255085021 is about 15971.3813115835. The cubic root of 255085021 is about 634.2030392893.

It can be divided in two parts, 2550 and 85021, that added together give a triangular number (87571 = T₄₁₈).

The spelling of 255085021 in words is "two hundred fifty-five million, eighty-five thousand, twenty-one".