225112321 has 6 divisors (see below), whose sum is σ = 261865410. Its totient is φ = 192953376.

The previous prime is 225112319. The next prime is 225112331. The reversal of 225112321 is 123211522.

It can be written as a sum of positive squares in only one way, i.e., 129072321 + 96040000 = 11361^2 + 9800^2 .

It is not a de Polignac number, because 225112321 - 2¹ = 225112319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (225112301) 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 5 ways as a sum of consecutive naturals, for example, 2297016 + ... + 2297113.

It is an arithmetic number, because the mean of its divisors is an integer number (43644235).

Almost surely, 2^225112321 is an apocalyptic number.

It is an amenable number.

225112321 is a deficient number, since it is larger than the sum of its proper divisors (36753089).

225112321 is an equidigital number, since it uses as much as digits as its factorization.

225112321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4594143 (or 4594136 counting only the distinct ones).

The product of its digits is 240, while the sum is 19.

The square root of 225112321 is about 15003.7435661904. The cubic root of 225112321 is about 608.3213914630.

Adding to 225112321 its reverse (123211522), we get a palindrome (348323843).

The spelling of 225112321 in words is "two hundred twenty-five million, one hundred twelve thousand, three hundred twenty-one".