225343343521 has 4 divisors (see below), whose sum is σ = 225345132544. Its totient is φ = 225341554500.

The previous prime is 225343343507. The next prime is 225343343543. The reversal of 225343343521 is 125343343522.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-225343343521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (225343343581) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 689985 + ... + 962686.

It is an arithmetic number, because the mean of its divisors is an integer number (56336283136).

Almost surely, 2^225343343521 is an apocalyptic number.

It is an amenable number.

225343343521 is a deficient number, since it is larger than the sum of its proper divisors (1789023).

225343343521 is a wasteful number, since it uses less digits than its factorization.

225343343521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1789022.

The product of its digits is 259200, while the sum is 37.

Subtracting from 225343343521 its reverse (125343343522), we obtain a palindrome (99999999999).

The spelling of 225343343521 in words is "two hundred twenty-five billion, three hundred forty-three million, three hundred forty-three thousand, five hundred twenty-one".