12012131243 has 4 divisors (see below), whose sum is σ = 13728150000. Its totient is φ = 10296112488.

The previous prime is 12012131231. The next prime is 12012131273. The reversal of 12012131243 is 34213121021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34213121021 = 367 ⋅93223763.

It is a cyclic number.

It is not a de Polignac number, because 12012131243 - 2¹⁰ = 12012130219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12012131273) 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, 858009368 + ... + 858009381.

It is an arithmetic number, because the mean of its divisors is an integer number (3432037500).

Almost surely, 2^12012131243 is an apocalyptic number.

12012131243 is a deficient number, since it is larger than the sum of its proper divisors (1716018757).

12012131243 is an equidigital number, since it uses as much as digits as its factorization.

12012131243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1716018756.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 12012131243 its reverse (34213121021), we get a palindrome (46225252264).

The spelling of 12012131243 in words is "twelve billion, twelve million, one hundred thirty-one thousand, two hundred forty-three".