12021111999 has 48 divisors (see below), whose sum is σ = 19064223360. Its totient is φ = 7253962560.

The previous prime is 12021111997. The next prime is 12021112001. The reversal of 12021111999 is 99911112021.

It is an interprime number because it is at equal distance from previous prime (12021111997) and next prime (12021112001).

It is not a de Polignac number, because 12021111999 - 2¹ = 12021111997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021111997) 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 47 ways as a sum of consecutive naturals, for example, 3056064 + ... + 3059994.

It is an arithmetic number, because the mean of its divisors is an integer number (397171320).

Almost surely, 2^12021111999 is an apocalyptic number.

12021111999 is a deficient number, since it is larger than the sum of its proper divisors (7043111361).

12021111999 is a wasteful number, since it uses less digits than its factorization.

12021111999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4452 (or 4449 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 36.

The spelling of 12021111999 in words is "twelve billion, twenty-one million, one hundred eleven thousand, nine hundred ninety-nine".