20001021002113 has 4 divisors (see below), whose sum is σ = 20004165328708. Its totient is φ = 19997876675520.

The previous prime is 20001021002071. The next prime is 20001021002191. The reversal of 20001021002113 is 31120012010002.

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 11911934168689 + 8089086833424 = 3451367^2 + 2844132^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20001021002113 is a prime.

It is a super-2 number, since 2×20001021002113² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20001021002093 and 20001021002102.

It is not an unprimeable number, because it can be changed into a prime (20001021000113) 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, 1572153756 + ... + 1572166477.

It is an arithmetic number, because the mean of its divisors is an integer number (5001041332177).

Almost surely, 2^{20001021002113} is an apocalyptic number.

It is an amenable number.

20001021002113 is a deficient number, since it is larger than the sum of its proper divisors (3144326595).

20001021002113 is an equidigital number, since it uses as much as digits as its factorization.

20001021002113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3144326594.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 20001021002113 its reverse (31120012010002), we get a palindrome (51121033012115).

The spelling of 20001021002113 in words is "twenty trillion, one billion, twenty-one million, two thousand, one hundred thirteen".