21323023000 has 64 divisors (see below), whose sum is σ = 49945896000. Its totient is φ = 8520659200.

The previous prime is 21323022989. The next prime is 21323023009. The reversal of 21323023000 is 32032312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21323023009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1038837 + ... + 1059163.

It is an arithmetic number, because the mean of its divisors is an integer number (780404625).

Almost surely, 2^21323023000 is an apocalyptic number.

21323023000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21323023000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24972948000).

21323023000 is an abundant number, since it is smaller than the sum of its proper divisors (28622873000).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21323023000 is a wasteful number, since it uses less digits than its factorization.

21323023000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21397 (or 21383 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 16.

Adding to 21323023000 its reverse (32032312), we get a palindrome (21355055312).

The spelling of 21323023000 in words is "twenty-one billion, three hundred twenty-three million, twenty-three thousand".