22220431225 has 6 divisors (see below), whose sum is σ = 27553334750. Its totient is φ = 17776344960.

The previous prime is 22220431223. The next prime is 22220431229. The reversal of 22220431225 is 52213402222.

It can be written as a sum of positive squares in 3 ways, for example, as 7572654441 + 14647776784 = 87021^2 + 121028^2 .

It is not a de Polignac number, because 22220431225 - 2¹ = 22220431223 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 888817249 = 22220431225 / (2 + 2 + 2 + 2 + 0 + 4 + 3 + 1 + 2 + 2 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 22220431225.

It is not an unprimeable number, because it can be changed into a prime (22220431223) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 444408600 + ... + 444408649.

Almost surely, 2^22220431225 is an apocalyptic number.

22220431225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

22220431225 is a deficient number, since it is larger than the sum of its proper divisors (5332903525).

22220431225 is an equidigital number, since it uses as much as digits as its factorization.

22220431225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 888817259 (or 888817254 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 25.

Adding to 22220431225 its reverse (52213402222), we get a palindrome (74433833447).

The spelling of 22220431225 in words is "twenty-two billion, two hundred twenty million, four hundred thirty-one thousand, two hundred twenty-five".