13369921 has 2 divisors, whose sum is σ = 13369922. Its totient is φ = 13369920.

The previous prime is 13369907. The next prime is 13369933. The reversal of 13369921 is 12996331.

13369921 is digitally balanced in base 3, 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., 11296321 + 2073600 = 3361^2 + 1440^2 .

It is an emirp because it is prime and its reverse (12996331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13369921 - 2²¹ = 11272769 is a prime.

It is not a weakly prime, because it can be changed into another prime (13369981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6684960 + 6684961.

It is an arithmetic number, because the mean of its divisors is an integer number (6684961).

Almost surely, 2^13369921 is an apocalyptic number.

It is an amenable number.

13369921 is a deficient number, since it is larger than the sum of its proper divisors (1).

13369921 is an equidigital number, since it uses as much as digits as its factorization.

13369921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8748, while the sum is 34.

The square root of 13369921 is about 3656.4902570635. The cubic root of 13369921 is about 237.3429195847.

The spelling of 13369921 in words is "thirteen million, three hundred sixty-nine thousand, nine hundred twenty-one".