225512321 has 4 divisors (see below), whose sum is σ = 232786944. Its totient is φ = 218237700.

The previous prime is 225512269. The next prime is 225512333. The reversal of 225512321 is 123215522.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 225512321 - 2²⁶ = 158403457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (225514321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3637265 + ... + 3637326.

It is an arithmetic number, because the mean of its divisors is an integer number (58196736).

Almost surely, 2^225512321 is an apocalyptic number.

It is an amenable number.

225512321 is a deficient number, since it is larger than the sum of its proper divisors (7274623).

225512321 is an equidigital number, since it uses as much as digits as its factorization.

225512321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7274622.

The product of its digits is 1200, while the sum is 23.

The square root of 225512321 is about 15017.0676565034. The cubic root of 225512321 is about 608.6814851485.

Adding to 225512321 its reverse (123215522), we get a palindrome (348727843).

The spelling of 225512321 in words is "two hundred twenty-five million, five hundred twelve thousand, three hundred twenty-one".