12131320011 has 4 divisors (see below), whose sum is σ = 16175093352. Its totient is φ = 8087546672.

The previous prime is 12131320009. The next prime is 12131320021. The reversal of 12131320011 is 11002313121.

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 12131320011 - 2¹ = 12131320009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12131320021) 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, 2021886666 + ... + 2021886671.

It is an arithmetic number, because the mean of its divisors is an integer number (4043773338).

Almost surely, 2^12131320011 is an apocalyptic number.

12131320011 is a deficient number, since it is larger than the sum of its proper divisors (4043773341).

12131320011 is an equidigital number, since it uses as much as digits as its factorization.

12131320011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4043773340.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 12131320011 its reverse (11002313121), we get a palindrome (23133633132).

The spelling of 12131320011 in words is "twelve billion, one hundred thirty-one million, three hundred twenty thousand, eleven".