225132505221 has 16 divisors (see below), whose sum is σ = 323697678080. Its totient is φ = 138358584000.

The previous prime is 225132505217. The next prime is 225132505223. The reversal of 225132505221 is 122505231522.

It is not a de Polignac number, because 225132505221 - 2² = 225132505217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225132505223) 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, 3814006 + ... + 3872583.

It is an arithmetic number, because the mean of its divisors is an integer number (20231104880).

Almost surely, 2^225132505221 is an apocalyptic number.

It is an amenable number.

225132505221 is a deficient number, since it is larger than the sum of its proper divisors (98565172859).

225132505221 is a wasteful number, since it uses less digits than its factorization.

225132505221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7687356.

The product of its (nonzero) digits is 12000, while the sum is 30.

Adding to 225132505221 its reverse (122505231522), we get a palindrome (347637736743).

The spelling of 225132505221 in words is "two hundred twenty-five billion, one hundred thirty-two million, five hundred five thousand, two hundred twenty-one".