21001232320013 has 16 divisors (see below), whose sum is σ = 22987845411840. Its totient is φ = 19027614500400.

The previous prime is 21001232320001. The next prime is 21001232320031. The reversal of 21001232320013 is 31002323210012.

It is not a de Polignac number, because 21001232320013 - 2⁸ = 21001232319757 is a prime.

It is a super-2 number, since 2×21001232320013² (a number of 27 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 (21001232320063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2150918 + ... + 6828536.

It is an arithmetic number, because the mean of its divisors is an integer number (1436740338240).

Almost surely, 2^{21001232320013} is an apocalyptic number.

It is an amenable number.

21001232320013 is a deficient number, since it is larger than the sum of its proper divisors (1986613091827).

21001232320013 is a wasteful number, since it uses less digits than its factorization.

21001232320013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4679008.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21001232320013 its reverse (31002323210012), we get a palindrome (52003555530025).

The spelling of 21001232320013 in words is "twenty-one trillion, one billion, two hundred thirty-two million, three hundred twenty thousand, thirteen".