13346821 has 4 divisors (see below), whose sum is σ = 13402444. Its totient is φ = 13291200.

The previous prime is 13346789. The next prime is 13346857. The reversal of 13346821 is 12864331.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11628100 + 1718721 = 3410^2 + 1311^2 .

It is a cyclic number.

It is not a de Polignac number, because 13346821 - 2⁵ = 13346789 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13346821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13346881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27450 + ... + 27931.

It is an arithmetic number, because the mean of its divisors is an integer number (3350611).

Almost surely, 2^13346821 is an apocalyptic number.

It is an amenable number.

13346821 is a deficient number, since it is larger than the sum of its proper divisors (55623).

13346821 is an equidigital number, since it uses as much as digits as its factorization.

13346821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55622.

The product of its digits is 3456, while the sum is 28.

The square root of 13346821 is about 3653.3301246945. The cubic root of 13346821 is about 237.2061503391.

The spelling of 13346821 in words is "thirteen million, three hundred forty-six thousand, eight hundred twenty-one".