12051021209 has 2 divisors, whose sum is σ = 12051021210. Its totient is φ = 12051021208.

The previous prime is 12051021167. The next prime is 12051021317. The reversal of 12051021209 is 90212015021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11378915584 + 672105625 = 106672^2 + 25925^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12051021209 is a prime.

It is a super-2 number, since 2×12051021209² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12051021509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6025510604 + 6025510605.

It is an arithmetic number, because the mean of its divisors is an integer number (6025510605).

Almost surely, 2^12051021209 is an apocalyptic number.

It is an amenable number.

12051021209 is a deficient number, since it is larger than the sum of its proper divisors (1).

12051021209 is an equidigital number, since it uses as much as digits as its factorization.

12051021209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 23.

The spelling of 12051021209 in words is "twelve billion, fifty-one million, twenty-one thousand, two hundred nine".