21300043331 has 4 divisors (see below), whose sum is σ = 24342906672. Its totient is φ = 18257179992.

The previous prime is 21300043321. The next prime is 21300043333. The reversal of 21300043331 is 13334000312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21300043331 - 2³⁴ = 4120174147 is a prime.

It is a super-2 number, since 2×21300043331² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21300043333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1521431660 + ... + 1521431673.

It is an arithmetic number, because the mean of its divisors is an integer number (6085726668).

Almost surely, 2^21300043331 is an apocalyptic number.

21300043331 is a deficient number, since it is larger than the sum of its proper divisors (3042863341).

21300043331 is an equidigital number, since it uses as much as digits as its factorization.

21300043331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3042863340.

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 21300043331 its reverse (13334000312), we get a palindrome (34634043643).

The spelling of 21300043331 in words is "twenty-one billion, three hundred million, forty-three thousand, three hundred thirty-one".