21032443313 has 24 divisors (see below), whose sum is σ = 24732639720. Its totient is φ = 17831923200.

The previous prime is 21032443291. The next prime is 21032443339. The reversal of 21032443313 is 31334423012.

It can be written as a sum of positive squares in 4 ways, for example, as 155950144 + 20876493169 = 12488^2 + 144487^2 .

It is not a de Polignac number, because 21032443313 - 2⁶ = 21032443249 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21032440313) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9268343 + ... + 9270611.

It is an arithmetic number, because the mean of its divisors is an integer number (1030526655).

Almost surely, 2^21032443313 is an apocalyptic number.

It is an amenable number.

21032443313 is a deficient number, since it is larger than the sum of its proper divisors (3700196407).

21032443313 is a wasteful number, since it uses less digits than its factorization.

21032443313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4257 (or 4250 counting only the distinct ones).

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

Adding to 21032443313 its reverse (31334423012), we get a palindrome (52366866325).

The spelling of 21032443313 in words is "twenty-one billion, thirty-two million, four hundred forty-three thousand, three hundred thirteen".