20331012321013 has 4 divisors (see below), whose sum is σ = 20826890670348. Its totient is φ = 19835133971680.

The previous prime is 20331012320987. The next prime is 20331012321017. The reversal of 20331012321013 is 31012321013302.

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 5264372314084 + 15066640006929 = 2294422^2 + 3881577^2 .

It is a cyclic number.

It is not a de Polignac number, because 20331012321013 - 2²¹ = 20331010223861 is a prime.

It is a super-2 number, since 2×20331012321013² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20331012321017) 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, 247939174606 + ... + 247939174687.

It is an arithmetic number, because the mean of its divisors is an integer number (5206722667587).

Almost surely, 2^{20331012321013} is an apocalyptic number.

It is an amenable number.

20331012321013 is a deficient number, since it is larger than the sum of its proper divisors (495878349335).

20331012321013 is an equidigital number, since it uses as much as digits as its factorization.

20331012321013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 495878349334.

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

Adding to 20331012321013 its reverse (31012321013302), we get a palindrome (51343333334315).

The spelling of 20331012321013 in words is "twenty trillion, three hundred thirty-one billion, twelve million, three hundred twenty-one thousand, thirteen".