21323031023 has 8 divisors (see below), whose sum is σ = 24374955648. Its totient is φ = 18272550744.

The previous prime is 21323031001. The next prime is 21323031077. The reversal of 21323031023 is 32013032312.

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

It is not a de Polignac number, because 21323031023 - 2⁶ = 21323030959 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21323030986 and 21323031004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21323031923) 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, 329261 + ... + 388662.

It is an arithmetic number, because the mean of its divisors is an integer number (3046869456).

Almost surely, 2^21323031023 is an apocalyptic number.

21323031023 is a deficient number, since it is larger than the sum of its proper divisors (3051924625).

21323031023 is an equidigital number, since it uses as much as digits as its factorization.

21323031023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 722173.

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

Adding to 21323031023 its reverse (32013032312), we get a palindrome (53336063335).

The spelling of 21323031023 in words is "twenty-one billion, three hundred twenty-three million, thirty-one thousand, twenty-three".