21021035200013 has 4 divisors (see below), whose sum is σ = 21031921289568. Its totient is φ = 21010149110460.

The previous prime is 21021035199991. The next prime is 21021035200027. The reversal of 21021035200013 is 31000253012012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21021035200013 - 2³² = 21016740232717 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 (21021035200073) 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, 5443041881 + ... + 5443045742.

It is an arithmetic number, because the mean of its divisors is an integer number (5257980322392).

Almost surely, 2^{21021035200013} is an apocalyptic number.

It is an amenable number.

21021035200013 is a deficient number, since it is larger than the sum of its proper divisors (10886089555).

21021035200013 is a wasteful number, since it uses less digits than its factorization.

21021035200013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10886089554.

The product of its (nonzero) digits is 360, while the sum is 20.

Adding to 21021035200013 its reverse (31000253012012), we get a palindrome (52021288212025).

The spelling of 21021035200013 in words is "twenty-one trillion, twenty-one billion, thirty-five million, two hundred thousand, thirteen".