12131230211 has 4 divisors (see below), whose sum is σ = 12131630592. Its totient is φ = 12130829832.

The previous prime is 12131230169. The next prime is 12131230271. The reversal of 12131230211 is 11203213121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11203213121 = 2437 ⋅4597133.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12131230211 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12131230211.

It is not an unprimeable number, because it can be changed into a prime (12131230271) 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, 150656 + ... + 216701.

It is an arithmetic number, because the mean of its divisors is an integer number (3032907648).

Almost surely, 2^12131230211 is an apocalyptic number.

12131230211 is a deficient number, since it is larger than the sum of its proper divisors (400381).

12131230211 is an equidigital number, since it uses as much as digits as its factorization.

12131230211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400380.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 12131230211 its reverse (11203213121), we get a palindrome (23334443332).

The spelling of 12131230211 in words is "twelve billion, one hundred thirty-one million, two hundred thirty thousand, two hundred eleven".