13304021 has 4 divisors (see below), whose sum is σ = 13336044. Its totient is φ = 13272000.

The previous prime is 13304003. The next prime is 13304029. The reversal of 13304021 is 12040331.

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 5244100 + 8059921 = 2290^2 + 2839^2 .

It is a cyclic number.

It is not a de Polignac number, because 13304021 - 2¹⁸ = 13041877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13303987 and 13304005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13304029) 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, 15380 + ... + 16221.

It is an arithmetic number, because the mean of its divisors is an integer number (3334011).

Almost surely, 2^13304021 is an apocalyptic number.

It is an amenable number.

13304021 is a deficient number, since it is larger than the sum of its proper divisors (32023).

13304021 is an equidigital number, since it uses as much as digits as its factorization.

13304021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32022.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 13304021 is about 3647.4677517423. The cubic root of 13304021 is about 236.9523247346.

Adding to 13304021 its reverse (12040331), we get a palindrome (25344352).

The spelling of 13304021 in words is "thirteen million, three hundred four thousand, twenty-one".