12005031243 has 4 divisors (see below), whose sum is σ = 16006708328. Its totient is φ = 8003354160.

The previous prime is 12005031229. The next prime is 12005031277. The reversal of 12005031243 is 34213050021.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 12005031243 - 2⁶ = 12005031179 is a prime.

It is a super-2 number, since 2×12005031243² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12005031293) 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 3 ways as a sum of consecutive naturals, for example, 2000838538 + ... + 2000838543.

It is an arithmetic number, because the mean of its divisors is an integer number (4001677082).

Almost surely, 2^12005031243 is an apocalyptic number.

12005031243 is a deficient number, since it is larger than the sum of its proper divisors (4001677085).

12005031243 is an equidigital number, since it uses as much as digits as its factorization.

12005031243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4001677084.

The product of its (nonzero) digits is 720, while the sum is 21.

Adding to 12005031243 its reverse (34213050021), we get a palindrome (46218081264).

The spelling of 12005031243 in words is "twelve billion, five million, thirty-one thousand, two hundred forty-three".