13193721 has 12 divisors (see below), whose sum is σ = 19100848. Its totient is φ = 8775864.

The previous prime is 13193701. The next prime is 13193723. The reversal of 13193721 is 12739131.

13193721 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13193721 - 2⁵ = 13193689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13193723) 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 11 ways as a sum of consecutive naturals, for example, 3306 + ... + 6108.

Almost surely, 2^13193721 is an apocalyptic number.

It is an amenable number.

13193721 is a deficient number, since it is larger than the sum of its proper divisors (5907127).

13193721 is a wasteful number, since it uses less digits than its factorization.

13193721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3332 (or 3329 counting only the distinct ones).

The product of its digits is 1134, while the sum is 27.

The square root of 13193721 is about 3632.3162031960. The cubic root of 13193721 is about 236.2956710227.

The spelling of 13193721 in words is "thirteen million, one hundred ninety-three thousand, seven hundred twenty-one".