21021033120013 has 4 divisors (see below), whose sum is σ = 21021220483708. Its totient is φ = 21020845756320.

The previous prime is 21021033120001. The next prime is 21021033120091. The reversal of 21021033120013 is 31002133012012.

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 20720731312009 + 300301808004 = 4552003^2 + 547998^2 .

It is a cyclic number.

It is not a de Polignac number, because 21021033120013 - 2²⁹ = 21020496249101 is a prime.

It is a super-2 number, since 2×21021033120013² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021033160013) 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, 93513456 + ... + 93737977.

It is an arithmetic number, because the mean of its divisors is an integer number (5255305120927).

Almost surely, 2^{21021033120013} is an apocalyptic number.

It is an amenable number.

21021033120013 is a deficient number, since it is larger than the sum of its proper divisors (187363695).

21021033120013 is a wasteful number, since it uses less digits than its factorization.

21021033120013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187363694.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21021033120013 its reverse (31002133012012), we get a palindrome (52023166132025).

The spelling of 21021033120013 in words is "twenty-one trillion, twenty-one billion, thirty-three million, one hundred twenty thousand, thirteen".