13396821 has 4 divisors (see below), whose sum is σ = 17862432. Its totient is φ = 8931212.

The previous prime is 13396769. The next prime is 13396841. The reversal of 13396821 is 12869331.

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.

It is a cyclic number.

It is not a de Polignac number, because 13396821 - 2¹³ = 13388629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13396841) 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, 2232801 + ... + 2232806.

It is an arithmetic number, because the mean of its divisors is an integer number (4465608).

Almost surely, 2^13396821 is an apocalyptic number.

It is an amenable number.

13396821 is a deficient number, since it is larger than the sum of its proper divisors (4465611).

13396821 is an equidigital number, since it uses as much as digits as its factorization.

13396821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4465610.

The product of its digits is 7776, while the sum is 33.

The square root of 13396821 is about 3660.1667994779. The cubic root of 13396821 is about 237.5019892724.

It can be divided in two parts, 1339 and 6821, that multiplied together give a palindrome (9133319).

The spelling of 13396821 in words is "thirteen million, three hundred ninety-six thousand, eight hundred twenty-one".