13202440021 has 4 divisors (see below), whose sum is σ = 13202934700. Its totient is φ = 13201945344.

The previous prime is 13202439983. The next prime is 13202440049. The reversal of 13202440021 is 12004420231.

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 9926136900 + 3276303121 = 99630^2 + 57239^2 .

It is a cyclic number.

It is not a de Polignac number, because 13202440021 - 2¹⁹ = 13201915733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13202440621) 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, 204876 + ... + 261493.

It is an arithmetic number, because the mean of its divisors is an integer number (3300733675).

Almost surely, 2^13202440021 is an apocalyptic number.

It is an amenable number.

13202440021 is a deficient number, since it is larger than the sum of its proper divisors (494679).

13202440021 is an equidigital number, since it uses as much as digits as its factorization.

13202440021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 494678.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 13202440021 its reverse (12004420231), we get a palindrome (25206860252).

The spelling of 13202440021 in words is "thirteen billion, two hundred two million, four hundred forty thousand, twenty-one".