12120021209 has 2 divisors, whose sum is σ = 12120021210. Its totient is φ = 12120021208.

The previous prime is 12120021197. The next prime is 12120021223. The reversal of 12120021209 is 90212002121.

It is a happy number.

12120021209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10491495184 + 1628526025 = 102428^2 + 40355^2 .

It is an emirp because it is prime and its reverse (90212002121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12120021209 - 2¹² = 12120017113 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (12120021239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6060010604 + 6060010605.

It is an arithmetic number, because the mean of its divisors is an integer number (6060010605).

Almost surely, 2^12120021209 is an apocalyptic number.

It is an amenable number.

12120021209 is a deficient number, since it is larger than the sum of its proper divisors (1).

12120021209 is an equidigital number, since it uses as much as digits as its factorization.

12120021209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 20.

The spelling of 12120021209 in words is "twelve billion, one hundred twenty million, twenty-one thousand, two hundred nine".