225021 has 8 divisors (see below), whose sum is σ = 303264. Its totient is φ = 148400.

The previous prime is 224993. The next prime is 225023. The reversal of 225021 is 120522.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 225021 - 2¹³ = 216829 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 224988 and 225006.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 225021.

It is not an unprimeable number, because it can be changed into a prime (225023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30 + ... + 671.

It is an arithmetic number, because the mean of its divisors is an integer number (37908).

2²²⁵⁰²¹ is an apocalyptic number.

It is an amenable number.

225021 is a deficient number, since it is larger than the sum of its proper divisors (78243).

225021 is a wasteful number, since it uses less digits than its factorization.

225021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 811.

The product of its (nonzero) digits is 40, while the sum is 12.

The square root of 225021 is about 474.3637844524. The cubic root of 225021 is about 60.8239121375.

Adding to 225021 its reverse (120522), we get a palindrome (345543).

The spelling of 225021 in words is "two hundred twenty-five thousand, twenty-one".