13393821 has 16 divisors (see below), whose sum is σ = 20691584. Its totient is φ = 7547904.

The previous prime is 13393817. The next prime is 13393847. The reversal of 13393821 is 12839331.

It is not a de Polignac number, because 13393821 - 2² = 13393817 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 (13393871) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2836 + ... + 5901.

It is an arithmetic number, because the mean of its divisors is an integer number (1293224).

Almost surely, 2^13393821 is an apocalyptic number.

It is an amenable number.

13393821 is a deficient number, since it is larger than the sum of its proper divisors (7297763).

13393821 is an equidigital number, since it uses as much as digits as its factorization.

13393821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8820.

The product of its digits is 3888, while the sum is 30.

The square root of 13393821 is about 3659.7569591436. The cubic root of 13393821 is about 237.4842597140.

The spelling of 13393821 in words is "thirteen million, three hundred ninety-three thousand, eight hundred twenty-one".