225171236321 has 4 divisors (see below), whose sum is σ = 225208077252. Its totient is φ = 225134395392.

The previous prime is 225171236291. The next prime is 225171236363. The reversal of 225171236321 is 123632171522.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 123632171522 = 2 ⋅61816085761.

It can be written as a sum of positive squares in 2 ways, for example, as 58641949921 + 166529286400 = 242161^2 + 408080^2 .

It is a cyclic number.

It is not a de Polignac number, because 225171236321 - 2¹⁰ = 225171235297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (225171236371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18411296 + ... + 18423521.

It is an arithmetic number, because the mean of its divisors is an integer number (56302019313).

Almost surely, 2^225171236321 is an apocalyptic number.

It is an amenable number.

225171236321 is a deficient number, since it is larger than the sum of its proper divisors (36840931).

225171236321 is an equidigital number, since it uses as much as digits as its factorization.

225171236321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36840930.

The product of its digits is 30240, while the sum is 35.

The spelling of 225171236321 in words is "two hundred twenty-five billion, one hundred seventy-one million, two hundred thirty-six thousand, three hundred twenty-one".