13665482021 has 2 divisors, whose sum is σ = 13665482022. Its totient is φ = 13665482020.

The previous prime is 13665482009. The next prime is 13665482023. The reversal of 13665482021 is 12028456631.

13665482021 is digitally balanced in base 2, 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., 13351802500 + 313679521 = 115550^2 + 17711^2 .

It is a cyclic number.

It is not a de Polignac number, because 13665482021 - 2⁶ = 13665481957 is a prime.

It is a Sophie Germain prime.

Together with 13665482023, it forms a pair of twin primes.

It is a Chen 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 (13665482023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6832741010 + 6832741011.

It is an arithmetic number, because the mean of its divisors is an integer number (6832741011).

Almost surely, 2^13665482021 is an apocalyptic number.

It is an amenable number.

13665482021 is a deficient number, since it is larger than the sum of its proper divisors (1).

13665482021 is an equidigital number, since it uses as much as digits as its factorization.

13665482021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69120, while the sum is 38.

The spelling of 13665482021 in words is "thirteen billion, six hundred sixty-five million, four hundred eighty-two thousand, twenty-one".