12131211211 has 12 divisors (see below), whose sum is σ = 14114956968. Its totient is φ = 10395867552.

The previous prime is 12131211139. The next prime is 12131211221. The reversal of 12131211211 is 11211213121.

It is a happy number.

It is not a de Polignac number, because 12131211211 - 2²³ = 12122822603 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12131211221) 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 11 ways as a sum of consecutive naturals, for example, 216840 + ... + 266986.

It is an arithmetic number, because the mean of its divisors is an integer number (1176246414).

Almost surely, 2^12131211211 is an apocalyptic number.

12131211211 is a deficient number, since it is larger than the sum of its proper divisors (1983745757).

12131211211 is an equidigital number, since it uses as much as digits as its factorization.

12131211211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55098 (or 55091 counting only the distinct ones).

The product of its digits is 24, while the sum is 16.

Adding to 12131211211 its reverse (11211213121), we get a palindrome (23342424332).

The spelling of 12131211211 in words is "twelve billion, one hundred thirty-one million, two hundred eleven thousand, two hundred eleven".