20021020211313 has 18 divisors (see below), whose sum is σ = 31787276351922. Its totient is φ = 12133951642560.

The previous prime is 20021020211279. The next prime is 20021020211317. The reversal of 20021020211313 is 31311202012002.

It can be written as a sum of positive squares in only one way, i.e., 10819547118864 + 9201473092449 = 3289308^2 + 3033393^2 .

It is not a de Polignac number, because 20021020211313 - 2¹⁷ = 20021020080241 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20021020211317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 9192386520 + ... + 9192388697.

It is an arithmetic number, because the mean of its divisors is an integer number (1765959797329).

Almost surely, 2^{20021020211313} is an apocalyptic number.

It is an amenable number.

20021020211313 is a deficient number, since it is larger than the sum of its proper divisors (11766256140609).

20021020211313 is a wasteful number, since it uses less digits than its factorization.

20021020211313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18384775245 (or 18384775231 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 20021020211313 its reverse (31311202012002), we get a palindrome (51332222223315).

The spelling of 20021020211313 in words is "twenty trillion, twenty-one billion, twenty million, two hundred eleven thousand, three hundred thirteen".