12012100909 has 2 divisors, whose sum is σ = 12012100910. Its totient is φ = 12012100908.

The previous prime is 12012100897. The next prime is 12012100913. The reversal of 12012100909 is 90900121021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11235364009 + 776736900 = 105997^2 + 27870^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12012100909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12012107909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6006050454 + 6006050455.

It is an arithmetic number, because the mean of its divisors is an integer number (6006050455).

Almost surely, 2^12012100909 is an apocalyptic number.

It is an amenable number.

12012100909 is a deficient number, since it is larger than the sum of its proper divisors (1).

12012100909 is an equidigital number, since it uses as much as digits as its factorization.

12012100909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 25.

The spelling of 12012100909 in words is "twelve billion, twelve million, one hundred thousand, nine hundred nine".