13243343021 has 4 divisors (see below), whose sum is σ = 13316510844. Its totient is φ = 13170175200.

The previous prime is 13243342999. The next prime is 13243343033. The reversal of 13243343021 is 12034334231.

13243343021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 1305376900 + 11937966121 = 36130^2 + 109261^2 .

It is a cyclic number.

It is not a de Polignac number, because 13243343021 - 2¹⁴ = 13243326637 is a prime.

It is a super-2 number, since 2×13243343021² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13243343081) 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 3 ways as a sum of consecutive naturals, for example, 36583640 + ... + 36584001.

It is an arithmetic number, because the mean of its divisors is an integer number (3329127711).

Almost surely, 2^13243343021 is an apocalyptic number.

It is an amenable number.

13243343021 is a deficient number, since it is larger than the sum of its proper divisors (73167823).

13243343021 is an equidigital number, since it uses as much as digits as its factorization.

13243343021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73167822.

The product of its (nonzero) digits is 5184, while the sum is 26.

Adding to 13243343021 its reverse (12034334231), we get a palindrome (25277677252).

The spelling of 13243343021 in words is "thirteen billion, two hundred forty-three million, three hundred forty-three thousand, twenty-one".