12012444221 has 2 divisors, whose sum is σ = 12012444222. Its totient is φ = 12012444220.

The previous prime is 12012444203. The next prime is 12012444253. The reversal of 12012444221 is 12244421021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11848322500 + 164121721 = 108850^2 + 12811^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12012444221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12012443221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6006222110 + 6006222111.

It is an arithmetic number, because the mean of its divisors is an integer number (6006222111).

Almost surely, 2^12012444221 is an apocalyptic number.

It is an amenable number.

12012444221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12012444221 is an equidigital number, since it uses as much as digits as its factorization.

12012444221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 12012444221 its reverse (12244421021), we get a palindrome (24256865242).

The spelling of 12012444221 in words is "twelve billion, twelve million, four hundred forty-four thousand, two hundred twenty-one".