13330021 has 4 divisors (see below), whose sum is σ = 13337344. Its totient is φ = 13322700.

The previous prime is 13330007. The next prime is 13330061. The reversal of 13330021 is 12003331.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 13330021 - 2¹¹ = 13327973 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 13329983 and 13330010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13330061) 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, 1426 + ... + 5356.

It is an arithmetic number, because the mean of its divisors is an integer number (3334336).

Almost surely, 2^13330021 is an apocalyptic number.

It is an amenable number.

13330021 is a deficient number, since it is larger than the sum of its proper divisors (7323).

13330021 is an equidigital number, since it uses as much as digits as its factorization.

13330021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7322.

The product of its (nonzero) digits is 54, while the sum is 13.

The square root of 13330021 is about 3651.0301286075. The cubic root of 13330021 is about 237.1065826460.

Adding to 13330021 its reverse (12003331), we get a palindrome (25333352).

The spelling of 13330021 in words is "thirteen million, three hundred thirty thousand, twenty-one".