13021013221 has 4 divisors (see below), whose sum is σ = 13040712844. Its totient is φ = 13001313600.

The previous prime is 13021013179. The next prime is 13021013237. The reversal of 13021013221 is 12231012031.

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 11785490721 + 1235522500 = 108561^2 + 35150^2 .

It is a cyclic number.

It is not a de Polignac number, because 13021013221 - 2¹¹ = 13021011173 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13021013195 and 13021013204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13021013251) 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, 9848820 + ... + 9850141.

It is an arithmetic number, because the mean of its divisors is an integer number (3260178211).

Almost surely, 2^13021013221 is an apocalyptic number.

It is an amenable number.

13021013221 is a deficient number, since it is larger than the sum of its proper divisors (19699623).

13021013221 is an equidigital number, since it uses as much as digits as its factorization.

13021013221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19699622.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 13021013221 its reverse (12231012031), we get a palindrome (25252025252).

The spelling of 13021013221 in words is "thirteen billion, twenty-one million, thirteen thousand, two hundred twenty-one".