259021 has 4 divisors (see below), whose sum is σ = 296032. Its totient is φ = 222012.

The previous prime is 259019. The next prime is 259033. The reversal of 259021 is 120952.

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 259021 - 2¹ = 259019 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 259021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (259001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18495 + ... + 18508.

It is an arithmetic number, because the mean of its divisors is an integer number (74008).

2²⁵⁹⁰²¹ is an apocalyptic number.

It is an amenable number.

259021 is a deficient number, since it is larger than the sum of its proper divisors (37011).

259021 is an equidigital number, since it uses as much as digits as its factorization.

259021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37010.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 259021 is about 508.9410574909. The cubic root of 259021 is about 63.7448336195.

Adding to 259021 its reverse (120952), we get a palindrome (379973).

The spelling of 259021 in words is "two hundred fifty-nine thousand, twenty-one".