225522533221 has 4 divisors (see below), whose sum is σ = 225525367744. Its totient is φ = 225519698700.

The previous prime is 225522533191. The next prime is 225522533279. The reversal of 225522533221 is 122335225522.

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, and also an emirpimes, since its reverse is a distinct semiprime: 122335225522 = 2 ⋅61167612761.

It is a cyclic number.

It is not a de Polignac number, because 225522533221 - 2²⁹ = 224985662309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225522533281) 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, 1294365 + ... + 1458226.

It is an arithmetic number, because the mean of its divisors is an integer number (56381341936).

Almost surely, 2^225522533221 is an apocalyptic number.

It is an amenable number.

225522533221 is a deficient number, since it is larger than the sum of its proper divisors (2834523).

225522533221 is an equidigital number, since it uses as much as digits as its factorization.

225522533221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2834522.

The product of its digits is 72000, while the sum is 34.

Adding to 225522533221 its reverse (122335225522), we get a palindrome (347857758743).

The spelling of 225522533221 in words is "two hundred twenty-five billion, five hundred twenty-two million, five hundred thirty-three thousand, two hundred twenty-one".