13343821 has 4 divisors (see below), whose sum is σ = 13353532. Its totient is φ = 13334112.

The previous prime is 13343809. The next prime is 13343843. The reversal of 13343821 is 12834331.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 7365796 + 5978025 = 2714^2 + 2445^2 .

It is a cyclic number.

It is not a de Polignac number, because 13343821 - 2⁵ = 13343789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13343881) 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, 2370 + ... + 5683.

It is an arithmetic number, because the mean of its divisors is an integer number (3338383).

Almost surely, 2^13343821 is an apocalyptic number.

It is an amenable number.

13343821 is a deficient number, since it is larger than the sum of its proper divisors (9711).

13343821 is an equidigital number, since it uses as much as digits as its factorization.

13343821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9710.

The product of its digits is 1728, while the sum is 25.

The square root of 13343821 is about 3652.9195173176. The cubic root of 13343821 is about 237.1883765243.

The spelling of 13343821 in words is "thirteen million, three hundred forty-three thousand, eight hundred twenty-one".