12120202109 has 2 divisors, whose sum is σ = 12120202110. Its totient is φ = 12120202108.

The previous prime is 12120202097. The next prime is 12120202111. The reversal of 12120202109 is 90120202121.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11424403225 + 695798884 = 106885^2 + 26378^2 .

It is a cyclic number.

It is not a de Polignac number, because 12120202109 - 2²⁰ = 12119153533 is a prime.

It is a Sophie Germain prime.

Together with 12120202111, 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 (12120202169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6060101054 + 6060101055.

It is an arithmetic number, because the mean of its divisors is an integer number (6060101055).

Almost surely, 2^12120202109 is an apocalyptic number.

It is an amenable number.

12120202109 is a deficient number, since it is larger than the sum of its proper divisors (1).

12120202109 is an equidigital number, since it uses as much as digits as its factorization.

12120202109 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 12120202109 in words is "twelve billion, one hundred twenty million, two hundred two thousand, one hundred nine".