13193821 has 2 divisors, whose sum is σ = 13193822. Its totient is φ = 13193820.

The previous prime is 13193813. The next prime is 13193827. The reversal of 13193821 is 12839131.

13193821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11148921 + 2044900 = 3339^2 + 1430^2 .

It is a cyclic number.

It is not a de Polignac number, because 13193821 - 2³ = 13193813 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13193821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13193827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6596910 + 6596911.

It is an arithmetic number, because the mean of its divisors is an integer number (6596911).

Almost surely, 2^13193821 is an apocalyptic number.

It is an amenable number.

13193821 is a deficient number, since it is larger than the sum of its proper divisors (1).

13193821 is an equidigital number, since it uses as much as digits as its factorization.

13193821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 28.

The square root of 13193821 is about 3632.3299684913. The cubic root of 13193821 is about 236.2962680114.

The spelling of 13193821 in words is "thirteen million, one hundred ninety-three thousand, eight hundred twenty-one".