13321030021 has 4 divisors (see below), whose sum is σ = 14345724652. Its totient is φ = 12296335392.

The previous prime is 13321030013. The next prime is 13321030061. The reversal of 13321030021 is 12003012331.

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 3238861921 + 10082168100 = 56911^2 + 100410^2 .

It is a cyclic number.

It is not a de Polignac number, because 13321030021 - 2³ = 13321030013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13321029977 and 13321030004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13321030061) 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 3 ways as a sum of consecutive naturals, for example, 512347296 + ... + 512347321.

It is an arithmetic number, because the mean of its divisors is an integer number (3586431163).

Almost surely, 2^13321030021 is an apocalyptic number.

It is an amenable number.

13321030021 is a deficient number, since it is larger than the sum of its proper divisors (1024694631).

13321030021 is a wasteful number, since it uses less digits than its factorization.

13321030021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1024694630.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 13321030021 its reverse (12003012331), we get a palindrome (25324042352).

The spelling of 13321030021 in words is "thirteen billion, three hundred twenty-one million, thirty thousand, twenty-one".