21200113013 has 4 divisors (see below), whose sum is σ = 21438316620. Its totient is φ = 20961909408.

The previous prime is 21200112937. The next prime is 21200113021. The reversal of 21200113013 is 31031100212.

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 5714301649 + 15485811364 = 75593^2 + 124442^2 .

It is not a de Polignac number, because 21200113013 - 2⁸ = 21200112757 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 (21200113063) 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, 119101670 + ... + 119101847.

It is an arithmetic number, because the mean of its divisors is an integer number (5359579155).

Almost surely, 2^21200113013 is an apocalyptic number.

It is an amenable number.

21200113013 is a deficient number, since it is larger than the sum of its proper divisors (238203607).

21200113013 is an equidigital number, since it uses as much as digits as its factorization.

21200113013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238203606.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 21200113013 its reverse (31031100212), we get a palindrome (52231213225).

The spelling of 21200113013 in words is "twenty-one billion, two hundred million, one hundred thirteen thousand, thirteen".