13343721 has 4 divisors (see below), whose sum is σ = 17791632. Its totient is φ = 8895812.

The previous prime is 13343647. The next prime is 13343731. The reversal of 13343721 is 12734331.

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 an emirpimes, since its reverse is a distinct semiprime: 12734331 = 3 ⋅4244777.

It is a cyclic number.

It is not a de Polignac number, because 13343721 - 2¹¹ = 13341673 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13343691 and 13343700.

It is not an unprimeable number, because it can be changed into a prime (13343731) 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, 2223951 + ... + 2223956.

It is an arithmetic number, because the mean of its divisors is an integer number (4447908).

Almost surely, 2^13343721 is an apocalyptic number.

It is an amenable number.

13343721 is a deficient number, since it is larger than the sum of its proper divisors (4447911).

13343721 is an equidigital number, since it uses as much as digits as its factorization.

13343721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4447910.

The product of its digits is 1512, while the sum is 24.

The square root of 13343721 is about 3652.9058296102. The cubic root of 13343721 is about 237.1877840179.

The spelling of 13343721 in words is "thirteen million, three hundred forty-three thousand, seven hundred twenty-one".