20312331003221 has 4 divisors (see below), whose sum is σ = 21195475829472. Its totient is φ = 19429186176972.

The previous prime is 20312331003187. The next prime is 20312331003233. The reversal of 20312331003221 is 12230013321302.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20312331003221 - 2³⁸ = 20037453096277 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 883144826227 = 20312331003221 / (2 + 0 + 3 + 1 + 2 + 3 + 3 + 1 + 0 + 0 + 3 + 2 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20312331003521) 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, 441572413091 + ... + 441572413136.

It is an arithmetic number, because the mean of its divisors is an integer number (5298868957368).

Almost surely, 2^{20312331003221} is an apocalyptic number.

It is an amenable number.

20312331003221 is a deficient number, since it is larger than the sum of its proper divisors (883144826251).

20312331003221 is an equidigital number, since it uses as much as digits as its factorization.

20312331003221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 883144826250.

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 20312331003221 its reverse (12230013321302), we get a palindrome (32542344324523).

The spelling of 20312331003221 in words is "twenty trillion, three hundred twelve billion, three hundred thirty-one million, three thousand, two hundred twenty-one".