225372321 has 8 divisors (see below), whose sum is σ = 333884960. Its totient is φ = 150248196.

The previous prime is 225372317. The next prime is 225372341. The reversal of 225372321 is 123273522.

It is a happy number.

It is not a de Polignac number, because 225372321 - 2² = 225372317 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 8347123 = 225372321 / (2 + 2 + 5 + 3 + 7 + 2 + 3 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (225372341) 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, 4173535 + ... + 4173588.

It is an arithmetic number, because the mean of its divisors is an integer number (41735620).

Almost surely, 2^225372321 is an apocalyptic number.

It is an amenable number.

225372321 is a deficient number, since it is larger than the sum of its proper divisors (108512639).

225372321 is an equidigital number, since it uses as much as digits as its factorization.

225372321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8347132 (or 8347126 counting only the distinct ones).

The product of its digits is 5040, while the sum is 27.

The square root of 225372321 is about 15012.4055700610. The cubic root of 225372321 is about 608.5555008301. Note that the first 4 decimals are identical.

The spelling of 225372321 in words is "two hundred twenty-five million, three hundred seventy-two thousand, three hundred twenty-one".