21001202013 has 12 divisors (see below), whose sum is σ = 30778621664. Its totient is φ = 12728001000.

The previous prime is 21001202011. The next prime is 21001202039. The reversal of 21001202013 is 31020210012.

It is not a de Polignac number, because 21001202013 - 2¹ = 21001202011 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21001202013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001202011) 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 11 ways as a sum of consecutive naturals, for example, 28926913 + ... + 28927638.

Almost surely, 2^21001202013 is an apocalyptic number.

It is an amenable number.

21001202013 is a deficient number, since it is larger than the sum of its proper divisors (9777419651).

21001202013 is a wasteful number, since it uses less digits than its factorization.

21001202013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57854576 (or 57854565 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 21001202013 its reverse (31020210012), we get a palindrome (52021412025).

The spelling of 21001202013 in words is "twenty-one billion, one million, two hundred two thousand, thirteen".