225252222252521 has 4 divisors (see below), whose sum is σ = 225255673559952. Its totient is φ = 225248770945092.

The previous prime is 225252222252511. The next prime is 225252222252557. The reversal of 225252222252521 is 125252222252522.

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 not a de Polignac number, because 225252222252521 - 2⁶ = 225252222252457 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (225252222252511) 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, 1725555815 + ... + 1725686348.

It is an arithmetic number, because the mean of its divisors is an integer number (56313918389988).

Almost surely, 2^{225252222252521} is an apocalyptic number.

It is an amenable number.

225252222252521 is a deficient number, since it is larger than the sum of its proper divisors (3451307431).

225252222252521 is an equidigital number, since it uses as much as digits as its factorization.

225252222252521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3451307430.

The product of its digits is 640000, while the sum is 41.

Subtracting from 225252222252521 its reverse (125252222252522), we obtain a palindrome (99999999999999).

The spelling of 225252222252521 in words is "two hundred twenty-five trillion, two hundred fifty-two billion, two hundred twenty-two million, two hundred fifty-two thousand, five hundred twenty-one".