12212645 has 12 divisors (see below), whose sum is σ = 15015276. Its totient is φ = 9535680.

The previous prime is 12212623. The next prime is 12212657. The reversal of 12212645 is 54621221.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 8300161 + 3912484 = 2881^2 + 1978^2 .

It is not a de Polignac number, because 12212645 - 2¹² = 12208549 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12212645.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8585 + ... + 9905.

It is an arithmetic number, because the mean of its divisors is an integer number (1251273).

Almost surely, 2^12212645 is an apocalyptic number.

It is an amenable number.

12212645 is a deficient number, since it is larger than the sum of its proper divisors (2802631).

12212645 is an equidigital number, since it uses as much as digits as its factorization.

12212645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1412 (or 1369 counting only the distinct ones).

The product of its digits is 960, while the sum is 23.

The square root of 12212645 is about 3494.6594970040. The cubic root of 12212645 is about 230.2872592248.

Adding to 12212645 its reverse (54621221), we get a palindrome (66833866).

The spelling of 12212645 in words is "twelve million, two hundred twelve thousand, six hundred forty-five".