12311132221 has 4 divisors (see below), whose sum is σ = 12311723452. Its totient is φ = 12310540992.

The previous prime is 12311132209. The next prime is 12311132263. The reversal of 12311132221 is 12223111321.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9982008100 + 2329124121 = 99910^2 + 48261^2 .

It is a cyclic number.

It is not a de Polignac number, because 12311132221 - 2¹¹ = 12311130173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12311132921) 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, 263196 + ... + 306421.

It is an arithmetic number, because the mean of its divisors is an integer number (3077930863).

Almost surely, 2^12311132221 is an apocalyptic number.

It is an amenable number.

12311132221 is a deficient number, since it is larger than the sum of its proper divisors (591231).

12311132221 is an equidigital number, since it uses as much as digits as its factorization.

12311132221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 591230.

The product of its digits is 144, while the sum is 19.

Adding to 12311132221 its reverse (12223111321), we get a palindrome (24534243542).

The spelling of 12311132221 in words is "twelve billion, three hundred eleven million, one hundred thirty-two thousand, two hundred twenty-one".