225321515221 has 16 divisors (see below), whose sum is σ = 246792476160. Its totient is φ = 204015689280.

The previous prime is 225321515189. The next prime is 225321515249. The reversal of 225321515221 is 122515123522.

It is a cyclic number.

It is not a de Polignac number, because 225321515221 - 2⁵ = 225321515189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225321545221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8271195 + ... + 8298391.

It is an arithmetic number, because the mean of its divisors is an integer number (15424529760).

Almost surely, 2^225321515221 is an apocalyptic number.

It is an amenable number.

225321515221 is a deficient number, since it is larger than the sum of its proper divisors (21470960939).

225321515221 is a wasteful number, since it uses less digits than its factorization.

225321515221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30204.

The product of its digits is 12000, while the sum is 31.

Adding to 225321515221 its reverse (122515123522), we get a palindrome (347836638743).

The spelling of 225321515221 in words is "two hundred twenty-five billion, three hundred twenty-one million, five hundred fifteen thousand, two hundred twenty-one".