255013221 has 4 divisors (see below), whose sum is σ = 340017632. Its totient is φ = 170008812.

The previous prime is 255013219. The next prime is 255013247. The reversal of 255013221 is 122310552.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 255013221 - 2¹ = 255013219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255013261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42502201 + ... + 42502206.

It is an arithmetic number, because the mean of its divisors is an integer number (85004408).

Almost surely, 2^255013221 is an apocalyptic number.

It is an amenable number.

255013221 is a deficient number, since it is larger than the sum of its proper divisors (85004411).

255013221 is an equidigital number, since it uses as much as digits as its factorization.

255013221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85004410.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 255013221 is about 15969.1333828733. The cubic root of 255013221 is about 634.1435296520.

Adding to 255013221 its reverse (122310552), we get a palindrome (377323773).

The spelling of 255013221 in words is "two hundred fifty-five million, thirteen thousand, two hundred twenty-one".