21024231321 has 4 divisors (see below), whose sum is σ = 28032308432. Its totient is φ = 14016154212.

The previous prime is 21024231311. The next prime is 21024231323. The reversal of 21024231321 is 12313242012.

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.

It is not a de Polignac number, because 21024231321 - 2⁹ = 21024230809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21024231323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3504038551 + ... + 3504038556.

It is an arithmetic number, because the mean of its divisors is an integer number (7008077108).

Almost surely, 2^21024231321 is an apocalyptic number.

It is an amenable number.

21024231321 is a deficient number, since it is larger than the sum of its proper divisors (7008077111).

21024231321 is an equidigital number, since it uses as much as digits as its factorization.

21024231321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7008077110.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21024231321 its reverse (12313242012), we get a palindrome (33337473333).

The spelling of 21024231321 in words is "twenty-one billion, twenty-four million, two hundred thirty-one thousand, three hundred twenty-one".