21002020002113 has 4 divisors (see below), whose sum is σ = 21043281338580. Its totient is φ = 20960758665648.

The previous prime is 21002020002109. The next prime is 21002020002133. The reversal of 21002020002113 is 31120002020012.

It is a happy number.

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 19846775520784 + 1155244481329 = 4454972^2 + 1074823^2 .

It is a cyclic number.

It is not a de Polignac number, because 21002020002113 - 2² = 21002020002109 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21002020002133) 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, 20630667470 + ... + 20630668487.

It is an arithmetic number, because the mean of its divisors is an integer number (5260820334645).

Almost surely, 2^{21002020002113} is an apocalyptic number.

It is an amenable number.

21002020002113 is a deficient number, since it is larger than the sum of its proper divisors (41261336467).

21002020002113 is an equidigital number, since it uses as much as digits as its factorization.

21002020002113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41261336466.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21002020002113 its reverse (31120002020012), we get a palindrome (52122022022125).

The spelling of 21002020002113 in words is "twenty-one trillion, two billion, twenty million, two thousand, one hundred thirteen".