225431787134521 has 32 divisors (see below), whose sum is σ = 259462620506880. Its totient is φ = 193859220192000.

The previous prime is 225431787134503. The next prime is 225431787134573. The reversal of 225431787134521 is 125431787134522.

It is not a de Polignac number, because 225431787134521 - 2⁹ = 225431787134009 is a prime.

It is a super-2 number, since 2×225431787134521² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (225431787134221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16625475 + ... + 26967943.

It is an arithmetic number, because the mean of its divisors is an integer number (8108206890840).

Almost surely, 2^{225431787134521} is an apocalyptic number.

It is an amenable number.

225431787134521 is a deficient number, since it is larger than the sum of its proper divisors (34030833372359).

225431787134521 is a wasteful number, since it uses less digits than its factorization.

225431787134521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10343457.

The product of its digits is 11289600, while the sum is 55.

Subtracting from 225431787134521 its reverse (125431787134522), we obtain a palindrome (99999999999999).

The spelling of 225431787134521 in words is "two hundred twenty-five trillion, four hundred thirty-one billion, seven hundred eighty-seven million, one hundred thirty-four thousand, five hundred twenty-one".