12000209843 has 4 divisors (see below), whose sum is σ = 12001157208. Its totient is φ = 11999262480.

The previous prime is 12000209743. The next prime is 12000209863. The reversal of 12000209843 is 34890200021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34890200021 = 2927 ⋅11920123.

It is a cyclic number.

It is not a de Polignac number, because 12000209843 - 2⁸ = 12000209587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12000209863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 454421 + ... + 480102.

It is an arithmetic number, because the mean of its divisors is an integer number (3000289302).

Almost surely, 2^12000209843 is an apocalyptic number.

12000209843 is a deficient number, since it is larger than the sum of its proper divisors (947365).

12000209843 is an equidigital number, since it uses as much as digits as its factorization.

12000209843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 947364.

The product of its (nonzero) digits is 3456, while the sum is 29.

Adding to 12000209843 its reverse (34890200021), we get a palindrome (46890409864).

The spelling of 12000209843 in words is "twelve billion, two hundred nine thousand, eight hundred forty-three".