13332821 has 4 divisors (see below), whose sum is σ = 13762944. Its totient is φ = 12902700.

The previous prime is 13332817. The next prime is 13332829. The reversal of 13332821 is 12823331.

13332821 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 13332821 - 2² = 13332817 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13332829) 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, 215015 + ... + 215076.

It is an arithmetic number, because the mean of its divisors is an integer number (3440736).

Almost surely, 2^13332821 is an apocalyptic number.

It is an amenable number.

13332821 is a deficient number, since it is larger than the sum of its proper divisors (430123).

13332821 is an equidigital number, since it uses as much as digits as its factorization.

13332821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430122.

The product of its digits is 864, while the sum is 23.

The square root of 13332821 is about 3651.4135618963. The cubic root of 13332821 is about 237.1231830688.

The spelling of 13332821 in words is "thirteen million, three hundred thirty-two thousand, eight hundred twenty-one".