12031330310221 has 4 divisors (see below), whose sum is σ = 12031346628252. Its totient is φ = 12031313992192.

The previous prime is 12031330310149. The next prime is 12031330310227. The reversal of 12031330310221 is 12201303313021.

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 8635193644900 + 3396136665321 = 2938570^2 + 1842861^2 .

It is a cyclic number.

It is not a de Polignac number, because 12031330310221 - 2²⁷ = 12031196092493 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12031330310192 and 12031330310201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12031330310227) 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, 6997990 + ... + 8546023.

It is an arithmetic number, because the mean of its divisors is an integer number (3007836657063).

Almost surely, 2^{12031330310221} is an apocalyptic number.

It is an amenable number.

12031330310221 is a deficient number, since it is larger than the sum of its proper divisors (16318031).

12031330310221 is an equidigital number, since it uses as much as digits as its factorization.

12031330310221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16318030.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 12031330310221 its reverse (12201303313021), we get a palindrome (24232633623242).

The spelling of 12031330310221 in words is "twelve trillion, thirty-one billion, three hundred thirty million, three hundred ten thousand, two hundred twenty-one".