250021 has 4 divisors (see below), whose sum is σ = 263200. Its totient is φ = 236844.

The previous prime is 250013. The next prime is 250027. The reversal of 250021 is 120052.

250021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a cyclic number.

It is not a de Polignac number, because 250021 - 2³ = 250013 is a prime.

It is a Duffinian number.

250021 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (250027) 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, 6561 + ... + 6598.

It is an arithmetic number, because the mean of its divisors is an integer number (65800).

250021 is a Friedman number, since it can be written as 500^2+21, using all its digits and the basic arithmetic operations.

2²⁵⁰⁰²¹ is an apocalyptic number.

It is an amenable number.

250021 is a deficient number, since it is larger than the sum of its proper divisors (13179).

250021 is a wasteful number, since it uses less digits than its factorization.

250021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13178.

The product of its (nonzero) digits is 20, while the sum is 10.

The square root of 250021 is about 500.0209995590. The cubic root of 250021 is about 62.9978163348.

Adding to 250021 its reverse (120052), we get a palindrome (370073).

The spelling of 250021 in words is "two hundred fifty thousand, twenty-one".