12012312243 has 4 divisors (see below), whose sum is σ = 16016416328. Its totient is φ = 8008208160.

The previous prime is 12012312229. The next prime is 12012312269. The reversal of 12012312243 is 34221321021.

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

It is a de Polignac number, because none of the positive numbers 2^k-12012312243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12012312283) 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, 2002052038 + ... + 2002052043.

It is an arithmetic number, because the mean of its divisors is an integer number (4004104082).

Almost surely, 2^12012312243 is an apocalyptic number.

12012312243 is a deficient number, since it is larger than the sum of its proper divisors (4004104085).

12012312243 is an equidigital number, since it uses as much as digits as its factorization.

12012312243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4004104084.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 12012312243 its reverse (34221321021), we get a palindrome (46233633264).

The spelling of 12012312243 in words is "twelve billion, twelve million, three hundred twelve thousand, two hundred forty-three".