20130031321013 has 4 divisors (see below), whose sum is σ = 20130041767008. Its totient is φ = 20130020875020.

The previous prime is 20130031320991. The next prime is 20130031321019. The reversal of 20130031321013 is 31012313003102.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20130031321013 - 2²² = 20130027126709 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 (20130031321019) 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, 1399331 + ... + 6497552.

It is an arithmetic number, because the mean of its divisors is an integer number (5032510441752).

Almost surely, 2^{20130031321013} is an apocalyptic number.

It is an amenable number.

20130031321013 is a deficient number, since it is larger than the sum of its proper divisors (10445995).

20130031321013 is an equidigital number, since it uses as much as digits as its factorization.

20130031321013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10445994.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 20130031321013 its reverse (31012313003102), we get a palindrome (51142344324115).

The spelling of 20130031321013 in words is "twenty trillion, one hundred thirty billion, thirty-one million, three hundred twenty-one thousand, thirteen".