12012020109 has 6 divisors (see below), whose sum is σ = 17350695726. Its totient is φ = 8008013400.

The previous prime is 12012020107. The next prime is 12012020131. The reversal of 12012020109 is 90102021021.

It can be written as a sum of positive squares in only one way, i.e., 11041386084 + 970634025 = 105078^2 + 31155^2 .

It is not a de Polignac number, because 12012020109 - 2¹ = 12012020107 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12012020091 and 12012020100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12012020107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 667334442 + ... + 667334459.

It is an arithmetic number, because the mean of its divisors is an integer number (2891782621).

Almost surely, 2^12012020109 is an apocalyptic number.

It is an amenable number.

12012020109 is a deficient number, since it is larger than the sum of its proper divisors (5338675617).

12012020109 is a wasteful number, since it uses less digits than its factorization.

12012020109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1334668907 (or 1334668904 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The spelling of 12012020109 in words is "twelve billion, twelve million, twenty thousand, one hundred nine".