12021009999 has 16 divisors (see below), whose sum is σ = 16069585920. Its totient is φ = 7993248480.

The previous prime is 12021009997. The next prime is 12021010009. The reversal of 12021009999 is 99990012021.

It is not a de Polignac number, because 12021009999 - 2¹ = 12021009997 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12021009999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021009991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2323914 + ... + 2329080.

It is an arithmetic number, because the mean of its divisors is an integer number (1004349120).

Almost surely, 2^12021009999 is an apocalyptic number.

12021009999 is a deficient number, since it is larger than the sum of its proper divisors (4048575921).

12021009999 is a wasteful number, since it uses less digits than its factorization.

12021009999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7030.

The product of its (nonzero) digits is 26244, while the sum is 42.

The spelling of 12021009999 in words is "twelve billion, twenty-one million, nine thousand, nine hundred ninety-nine".