13412821 has 2 divisors, whose sum is σ = 13412822. Its totient is φ = 13412820.

The previous prime is 13412807. The next prime is 13412843. The reversal of 13412821 is 12821431.

It is a happy number.

It is an a-pointer prime, because the next prime (13412843) can be obtained adding 13412821 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12006225 + 1406596 = 3465^2 + 1186^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13412821 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13412792 and 13412801.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13412891) 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 as a sum of consecutive naturals, namely, 6706410 + 6706411.

It is an arithmetic number, because the mean of its divisors is an integer number (6706411).

Almost surely, 2^13412821 is an apocalyptic number.

It is an amenable number.

13412821 is a deficient number, since it is larger than the sum of its proper divisors (1).

13412821 is an equidigital number, since it uses as much as digits as its factorization.

13412821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 384, while the sum is 22.

The square root of 13412821 is about 3662.3518400066. The cubic root of 13412821 is about 237.5965022423.

The spelling of 13412821 in words is "thirteen million, four hundred twelve thousand, eight hundred twenty-one".