224521 has 4 divisors (see below), whose sum is σ = 244944. Its totient is φ = 204100.

The previous prime is 224513. The next prime is 224527. The reversal of 224521 is 125422.

224521 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 224521 - 2³ = 224513 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 8.

It is a junction number, because it is equal to n+sod(n) for n = 224495 and 224504.

It is not an unprimeable number, because it can be changed into a prime (224527) 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, 10195 + ... + 10216.

It is an arithmetic number, because the mean of its divisors is an integer number (61236).

2²²⁴⁵²¹ is an apocalyptic number.

It is an amenable number.

224521 is a deficient number, since it is larger than the sum of its proper divisors (20423).

224521 is a wasteful number, since it uses less digits than its factorization.

224521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20422.

The product of its digits is 160, while the sum is 16.

The square root of 224521 is about 473.8364696813. The cubic root of 224521 is about 60.7788281836.

Adding to 224521 its reverse (125422), we get a palindrome (349943).

Subtracting from 224521 its reverse (125422), we obtain a palindrome (99099).

The spelling of 224521 in words is "two hundred twenty-four thousand, five hundred twenty-one".