12212225 has 12 divisors (see below), whose sum is σ = 15187644. Its totient is φ = 9741120.

The previous prime is 12212201. The next prime is 12212237. The reversal of 12212225 is 52221221.

It can be written as a sum of positive squares in 6 ways, for example, as 461041 + 11751184 = 679^2 + 3428^2 .

It is a de Polignac number, because none of the positive numbers 2^k-12212225 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13487 + ... + 14363.

It is an arithmetic number, because the mean of its divisors is an integer number (1265637).

Almost surely, 2^12212225 is an apocalyptic number.

It is an amenable number.

12212225 is a deficient number, since it is larger than the sum of its proper divisors (2975419).

12212225 is an equidigital number, since it uses as much as digits as its factorization.

12212225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1444 (or 1439 counting only the distinct ones).

The product of its digits is 160, while the sum is 17.

The square root of 12212225 is about 3494.5994047959. The cubic root of 12212225 is about 230.2846192900.

Adding to 12212225 its reverse (52221221), we get a palindrome (64433446).

The spelling of 12212225 in words is "twelve million, two hundred twelve thousand, two hundred twenty-five".