225532221 has 8 divisors (see below), whose sum is σ = 300830304. Its totient is φ = 150294480.

The previous prime is 225532193. The next prime is 225532271. The reversal of 225532221 is 122235522.

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

It is not a de Polignac number, because 225532221 - 2⁶ = 225532157 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 225532191 and 225532200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225532271) 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, 5491 + ... + 21936.

It is an arithmetic number, because the mean of its divisors is an integer number (37603788).

Almost surely, 2^225532221 is an apocalyptic number.

It is an amenable number.

225532221 is a deficient number, since it is larger than the sum of its proper divisors (75298083).

225532221 is a wasteful number, since it uses less digits than its factorization.

225532221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30171.

The product of its digits is 2400, while the sum is 24.

The square root of 225532221 is about 15017.7302213084. The cubic root of 225532221 is about 608.6993886865.

Adding to 225532221 its reverse (122235522), we get a palindrome (347767743).

The spelling of 225532221 in words is "two hundred twenty-five million, five hundred thirty-two thousand, two hundred twenty-one".