12031133221 has 4 divisors (see below), whose sum is σ = 12141510700. Its totient is φ = 11920755744.

The previous prime is 12031133209. The next prime is 12031133237. The reversal of 12031133221 is 12233113021.

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 4161669121 + 7869464100 = 64511^2 + 88710^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12031133221 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 (12031133021) 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, 55188576 + ... + 55188793.

It is an arithmetic number, because the mean of its divisors is an integer number (3035377675).

Almost surely, 2^12031133221 is an apocalyptic number.

It is an amenable number.

12031133221 is a deficient number, since it is larger than the sum of its proper divisors (110377479).

12031133221 is a wasteful number, since it uses less digits than its factorization.

12031133221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110377478.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 12031133221 its reverse (12233113021), we get a palindrome (24264246242).

The spelling of 12031133221 in words is "twelve billion, thirty-one million, one hundred thirty-three thousand, two hundred twenty-one".