13321021 has 4 divisors (see below), whose sum is σ = 15224032. Its totient is φ = 11418012.

The previous prime is 13321003. The next prime is 13321027. The reversal of 13321021 is 12012331.

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 13321021 - 2⁷ = 13320893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13320992 and 13321010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13321027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 951495 + ... + 951508.

It is an arithmetic number, because the mean of its divisors is an integer number (3806008).

Almost surely, 2^13321021 is an apocalyptic number.

It is an amenable number.

13321021 is a deficient number, since it is larger than the sum of its proper divisors (1903011).

13321021 is an equidigital number, since it uses as much as digits as its factorization.

13321021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1903010.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 13321021 is about 3649.7973916370. The cubic root of 13321021 is about 237.0532083944.

Adding to 13321021 its reverse (12012331), we get a palindrome (25333352).

The spelling of 13321021 in words is "thirteen million, three hundred twenty-one thousand, twenty-one".