225253434521 has 4 divisors (see below), whose sum is σ = 225254858532. Its totient is φ = 225252010512.

The previous prime is 225253434443. The next prime is 225253434583. The reversal of 225253434521 is 125434352522.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 125434352522 = 2 ⋅62717176261.

It can be written as a sum of positive squares in 2 ways, for example, as 59226523225 + 166026911296 = 243365^2 + 407464^2 .

It is a cyclic number.

It is not a de Polignac number, because 225253434521 - 2¹⁰ = 225253433497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (225253434421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 440126 + ... + 802631.

It is an arithmetic number, because the mean of its divisors is an integer number (56313714633).

Almost surely, 2^225253434521 is an apocalyptic number.

It is an amenable number.

225253434521 is a deficient number, since it is larger than the sum of its proper divisors (1424011).

225253434521 is a wasteful number, since it uses less digits than its factorization.

225253434521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1424010.

The product of its digits is 288000, while the sum is 38.

The spelling of 225253434521 in words is "two hundred twenty-five billion, two hundred fifty-three million, four hundred thirty-four thousand, five hundred twenty-one".