225231321 has 32 divisors (see below), whose sum is σ = 356555520. Its totient is φ = 123780096.

The previous prime is 225231319. The next prime is 225231343. The reversal of 225231321 is 123132522.

It is not a de Polignac number, because 225231321 - 2¹ = 225231319 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (225232321) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 67525 + ... + 70781.

It is an arithmetic number, because the mean of its divisors is an integer number (11142360).

Almost surely, 2^225231321 is an apocalyptic number.

225231321 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

225231321 is a deficient number, since it is larger than the sum of its proper divisors (131324199).

225231321 is a wasteful number, since it uses less digits than its factorization.

225231321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3393.

The product of its digits is 720, while the sum is 21.

The square root of 225231321 is about 15007.7087191883. The cubic root of 225231321 is about 608.4285638784.

Adding to 225231321 its reverse (123132522), we get a palindrome (348363843).

The spelling of 225231321 in words is "two hundred twenty-five million, two hundred thirty-one thousand, three hundred twenty-one".