255202021 has 2 divisors, whose sum is σ = 255202022. Its totient is φ = 255202020.

The previous prime is 255201983. The next prime is 255202037. The reversal of 255202021 is 120202552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 144720900 + 110481121 = 12030^2 + 10511^2 .

It is a cyclic number.

It is not a de Polignac number, because 255202021 - 2⁹ = 255201509 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 255202021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255202921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127601010 + 127601011.

It is an arithmetic number, because the mean of its divisors is an integer number (127601011).

Almost surely, 2^255202021 is an apocalyptic number.

It is an amenable number.

255202021 is a deficient number, since it is larger than the sum of its proper divisors (1).

255202021 is an equidigital number, since it uses as much as digits as its factorization.

255202021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 255202021 is about 15975.0436932110. The cubic root of 255202021 is about 634.2999878982.

Adding to 255202021 its reverse (120202552), we get a palindrome (375404573).

The spelling of 255202021 in words is "two hundred fifty-five million, two hundred two thousand, twenty-one".