12009999999 has 32 divisors (see below), whose sum is σ = 17374072320. Its totient is φ = 7356685952.

The previous prime is 12009999949. The next prime is 12010000021. The reversal of 12009999999 is 99999990021.

It is a cyclic number.

It is not a de Polignac number, because 12009999999 - 2²⁴ = 11993222783 is a prime.

12009999999 is a modest number, since divided by 999999 gives 12009 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12009999919) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 378964 + ... + 409430.

It is an arithmetic number, because the mean of its divisors is an integer number (542939760).

Almost surely, 2^12009999999 is an apocalyptic number.

12009999999 is a deficient number, since it is larger than the sum of its proper divisors (5364072321).

12009999999 is a wasteful number, since it uses less digits than its factorization.

12009999999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30719.

The product of its (nonzero) digits is 9565938, while the sum is 66.

The spelling of 12009999999 in words is "twelve billion, nine million, nine hundred ninety-nine thousand, nine hundred ninety-nine".