20013131131021 has 8 divisors (see below), whose sum is σ = 22967849237760. Its totient is φ = 17082337867728.

The previous prime is 20013131130997. The next prime is 20013131131051. The reversal of 20013131131021 is 12013113131002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20013131131021 - 2¹⁵ = 20013131098253 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20013131131021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20013131131051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5981209066 + ... + 5981212411.

It is an arithmetic number, because the mean of its divisors is an integer number (2870981154720).

Almost surely, 2^{20013131131021} is an apocalyptic number.

It is an amenable number.

20013131131021 is a deficient number, since it is larger than the sum of its proper divisors (2954718106739).

20013131131021 is a wasteful number, since it uses less digits than its factorization.

20013131131021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11962421723.

The product of its (nonzero) digits is 108, while the sum is 19.

Adding to 20013131131021 its reverse (12013113131002), we get a palindrome (32026244262023).

The spelling of 20013131131021 in words is "twenty trillion, thirteen billion, one hundred thirty-one million, one hundred thirty-one thousand, twenty-one".