255200021 has 2 divisors, whose sum is σ = 255200022. Its totient is φ = 255200020.

The previous prime is 255199999. The next prime is 255200041. The reversal of 255200021 is 120002552.

255200021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 191822500 + 63377521 = 13850^2 + 7961^2 .

It is a cyclic number.

It is not a de Polignac number, because 255200021 - 2²⁶ = 188091157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255200041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127600010 + 127600011.

It is an arithmetic number, because the mean of its divisors is an integer number (127600011).

Almost surely, 2^255200021 is an apocalyptic number.

It is an amenable number.

255200021 is a deficient number, since it is larger than the sum of its proper divisors (1).

255200021 is an equidigital number, since it uses as much as digits as its factorization.

255200021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 200, while the sum is 17.

The square root of 255200021 is about 15974.9810954505. The cubic root of 255200021 is about 634.2983309060.

Adding to 255200021 its reverse (120002552), we get a palindrome (375202573).

The spelling of 255200021 in words is "two hundred fifty-five million, two hundred thousand, twenty-one".