21200031323 has 8 divisors (see below), whose sum is σ = 21665306736. Its totient is φ = 20737173600.

The previous prime is 21200031301. The next prime is 21200031343. The reversal of 21200031323 is 32313000212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21200031323 is a prime.

It is a super-2 number, since 2×21200031323² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21200031343) 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 7 ways as a sum of consecutive naturals, for example, 586688 + ... + 621773.

It is an arithmetic number, because the mean of its divisors is an integer number (2708163342).

Almost surely, 2^21200031323 is an apocalyptic number.

21200031323 is a deficient number, since it is larger than the sum of its proper divisors (465275413).

21200031323 is a wasteful number, since it uses less digits than its factorization.

21200031323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1208845.

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 21200031323 its reverse (32313000212), we get a palindrome (53513031535).

The spelling of 21200031323 in words is "twenty-one billion, two hundred million, thirty-one thousand, three hundred twenty-three".