21320322423 has 8 divisors (see below), whose sum is σ = 28908912000. Its totient is φ = 13972640568.

The previous prime is 21320322391. The next prime is 21320322433. The reversal of 21320322423 is 32422302312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21320322423 - 2⁵ = 21320322391 is a prime.

It is a super-2 number, since 2×21320322423² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21320322393 and 21320322402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21320322433) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60226723 + ... + 60227076.

It is an arithmetic number, because the mean of its divisors is an integer number (3613614000).

Almost surely, 2^21320322423 is an apocalyptic number.

21320322423 is a deficient number, since it is larger than the sum of its proper divisors (7588589577).

21320322423 is a wasteful number, since it uses less digits than its factorization.

21320322423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120453861.

The product of its (nonzero) digits is 3456, while the sum is 24.

Adding to 21320322423 its reverse (32422302312), we get a palindrome (53742624735).

The spelling of 21320322423 in words is "twenty-one billion, three hundred twenty million, three hundred twenty-two thousand, four hundred twenty-three".