13305444021 has 10 divisors (see below), whose sum is σ = 19876033782. Its totient is φ = 8870295960.

The previous prime is 13305444011. The next prime is 13305444049. The reversal of 13305444021 is 12044450331.

It is a happy number.

13305444021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 13175825796 + 129618225 = 114786^2 + 11385^2 .

It is not a de Polignac number, because 13305444021 - 2⁹ = 13305443509 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13305444011) 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 in 9 ways as a sum of consecutive naturals, for example, 82132290 + ... + 82132451.

Almost surely, 2^13305444021 is an apocalyptic number.

It is an amenable number.

13305444021 is a deficient number, since it is larger than the sum of its proper divisors (6570589761).

13305444021 is an equidigital number, since it uses as much as digits as its factorization.

13305444021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164264753 (or 164264744 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

Adding to 13305444021 its reverse (12044450331), we get a palindrome (25349894352).

The spelling of 13305444021 in words is "thirteen billion, three hundred five million, four hundred forty-four thousand, twenty-one".