13243324021 has 4 divisors (see below), whose sum is σ = 13467787200. Its totient is φ = 13018860844.

The previous prime is 13243324013. The next prime is 13243324097. The reversal of 13243324021 is 12042334231.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12042334231 = 2963 ⋅4064237.

It is a cyclic number.

It is not a de Polignac number, because 13243324021 - 2³ = 13243324013 is a prime.

It is a super-2 number, since 2×13243324021² (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 (13243324001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 112231501 + ... + 112231618.

It is an arithmetic number, because the mean of its divisors is an integer number (3366946800).

Almost surely, 2^13243324021 is an apocalyptic number.

It is an amenable number.

13243324021 is a deficient number, since it is larger than the sum of its proper divisors (224463179).

13243324021 is an equidigital number, since it uses as much as digits as its factorization.

13243324021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224463178.

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 13243324021 its reverse (12042334231), we get a palindrome (25285658252).

The spelling of 13243324021 in words is "thirteen billion, two hundred forty-three million, three hundred twenty-four thousand, twenty-one".