2221250225 has 6 divisors (see below), whose sum is σ = 2754350310. Its totient is φ = 1777000160.

The previous prime is 2221250219. The next prime is 2221250237. The reversal of 2221250225 is 5220521222.

It can be written as a sum of positive squares in 3 ways, for example, as 107584 + 2221142641 = 328^2 + 47129^2 .

It is not a de Polignac number, because 2221250225 - 2⁸ = 2221249969 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2221250225.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 44424980 + ... + 44425029.

It is an arithmetic number, because the mean of its divisors is an integer number (459058385).

Almost surely, 2^2221250225 is an apocalyptic number.

2221250225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2221250225 is a deficient number, since it is larger than the sum of its proper divisors (533100085).

2221250225 is an equidigital number, since it uses as much as digits as its factorization.

2221250225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88850019 (or 88850014 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 2221250225 is about 47130.1413640995. The cubic root of 2221250225 is about 1304.7655906191.

Adding to 2221250225 its reverse (5220521222), we get a palindrome (7441771447).

The spelling of 2221250225 in words is "two billion, two hundred twenty-one million, two hundred fifty thousand, two hundred twenty-five".