225323121323521 has 8 divisors (see below), whose sum is σ = 244803064421160. Its totient is φ = 206149948983552.

The previous prime is 225323121323483. The next prime is 225323121323539. The reversal of 225323121323521 is 125323121323522.

It can be written as a sum of positive squares in 4 ways, for example, as 15569771681025 + 209753349642496 = 3945855^2 + 14482864^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 225323121323521 - 2⁷ = 225323121323393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (225323121323551) 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, 76692687886 + ... + 76692690823.

It is an arithmetic number, because the mean of its divisors is an integer number (30600383052645).

Almost surely, 2^{225323121323521} is an apocalyptic number.

It is an amenable number.

225323121323521 is a deficient number, since it is larger than the sum of its proper divisors (19479943097639).

225323121323521 is a wasteful number, since it uses less digits than its factorization.

225323121323521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153385378835.

The product of its digits is 129600, while the sum is 37.

Subtracting from 225323121323521 its reverse (125323121323522), we obtain a palindrome (99999999999999).

The spelling of 225323121323521 in words is "two hundred twenty-five trillion, three hundred twenty-three billion, one hundred twenty-one million, three hundred twenty-three thousand, five hundred twenty-one".