12001212009 has 12 divisors (see below), whose sum is σ = 17365557300. Its totient is φ = 7986743424.

The previous prime is 12001211987. The next prime is 12001212019. The reversal of 12001212009 is 90021210021.

It can be written as a sum of positive squares in 2 ways, for example, as 4651922025 + 7349289984 = 68205^2 + 85728^2 .

It is not a de Polignac number, because 12001212009 - 2⁵ = 12001211977 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12001211982 and 12001212000.

It is not an unprimeable number, because it can be changed into a prime (12001212019) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1166644 + ... + 1176885.

It is an arithmetic number, because the mean of its divisors is an integer number (1447129775).

Almost surely, 2^12001212009 is an apocalyptic number.

It is an amenable number.

12001212009 is a deficient number, since it is larger than the sum of its proper divisors (5364345291).

12001212009 is a wasteful number, since it uses less digits than its factorization.

12001212009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2344104 (or 2344101 counting only the distinct ones).

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

The spelling of 12001212009 in words is "twelve billion, one million, two hundred twelve thousand, nine".