12021212909 has 2 divisors, whose sum is σ = 12021212910. Its totient is φ = 12021212908.

The previous prime is 12021212899. The next prime is 12021212911. The reversal of 12021212909 is 90921212021.

12021212909 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8177584900 + 3843628009 = 90430^2 + 61997^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12021212909 is a prime.

It is a Sophie Germain prime.

Together with 12021212911, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12021212009) 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, 6010606454 + 6010606455.

It is an arithmetic number, because the mean of its divisors is an integer number (6010606455).

Almost surely, 2^12021212909 is an apocalyptic number.

It is an amenable number.

12021212909 is a deficient number, since it is larger than the sum of its proper divisors (1).

12021212909 is an equidigital number, since it uses as much as digits as its factorization.

12021212909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 29.

The spelling of 12021212909 in words is "twelve billion, twenty-one million, two hundred twelve thousand, nine hundred nine".