255275021 has 2 divisors, whose sum is σ = 255275022. Its totient is φ = 255275020.

The previous prime is 255275017. The next prime is 255275063. The reversal of 255275021 is 120572552.

255275021 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., 139948900 + 115326121 = 11830^2 + 10739^2 .

It is a cyclic number.

It is not a de Polignac number, because 255275021 - 2² = 255275017 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255275221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127637510 + 127637511.

It is an arithmetic number, because the mean of its divisors is an integer number (127637511).

Almost surely, 2^255275021 is an apocalyptic number.

It is an amenable number.

255275021 is a deficient number, since it is larger than the sum of its proper divisors (1).

255275021 is an equidigital number, since it uses as much as digits as its factorization.

255275021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7000, while the sum is 29.

The square root of 255275021 is about 15977.3283436249. The cubic root of 255275021 is about 634.3604621904.

The spelling of 255275021 in words is "two hundred fifty-five million, two hundred seventy-five thousand, twenty-one".