12031311211 has 4 divisors (see below), whose sum is σ = 12235231800. Its totient is φ = 11827390624.

The previous prime is 12031311209. The next prime is 12031311239. The reversal of 12031311211 is 11211313021.

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 12031311211 - 2¹ = 12031311209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12031311251) 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, 101960206 + ... + 101960323.

It is an arithmetic number, because the mean of its divisors is an integer number (3058807950).

Almost surely, 2^12031311211 is an apocalyptic number.

12031311211 is a deficient number, since it is larger than the sum of its proper divisors (203920589).

12031311211 is an equidigital number, since it uses as much as digits as its factorization.

12031311211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203920588.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 12031311211 its reverse (11211313021), we get a palindrome (23242624232).

The spelling of 12031311211 in words is "twelve billion, thirty-one million, three hundred eleven thousand, two hundred eleven".