12131112211 has 4 divisors (see below), whose sum is σ = 12169870072. Its totient is φ = 12092354352.

The previous prime is 12131112173. The next prime is 12131112223. The reversal of 12131112211 is 11221113121.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 12131112211 - 2¹³ = 12131104019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12131112251) 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, 19378461 + ... + 19379086.

It is an arithmetic number, because the mean of its divisors is an integer number (3042467518).

Almost surely, 2^12131112211 is an apocalyptic number.

12131112211 is a deficient number, since it is larger than the sum of its proper divisors (38757861).

12131112211 is an equidigital number, since it uses as much as digits as its factorization.

12131112211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38757860.

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

Adding to 12131112211 its reverse (11221113121), we get a palindrome (23352225332).

The spelling of 12131112211 in words is "twelve billion, one hundred thirty-one million, one hundred twelve thousand, two hundred eleven".