13813421 has 2 divisors, whose sum is σ = 13813422. Its totient is φ = 13813420.

The previous prime is 13813417. The next prime is 13813439. The reversal of 13813421 is 12431831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9853321 + 3960100 = 3139^2 + 1990^2 .

It is a cyclic number.

It is not a de Polignac number, because 13813421 - 2² = 13813417 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13813411) 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, 6906710 + 6906711.

It is an arithmetic number, because the mean of its divisors is an integer number (6906711).

Almost surely, 2^13813421 is an apocalyptic number.

It is an amenable number.

13813421 is a deficient number, since it is larger than the sum of its proper divisors (1).

13813421 is an equidigital number, since it uses as much as digits as its factorization.

13813421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 576, while the sum is 23.

The square root of 13813421 is about 3716.6410910929. The cubic root of 13813421 is about 239.9387633118.

The spelling of 13813421 in words is "thirteen million, eight hundred thirteen thousand, four hundred twenty-one".