21323303232 has 224 divisors, whose sum is σ = 70522819584. Its totient is φ = 5524070400.

The previous prime is 21323303227. The next prime is 21323303233. The reversal of 21323303232 is 23230332312.

It is a tau number, because it is divible by the number of its divisors (224).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21323303233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6399807 + ... + 6403137.

It is an arithmetic number, because the mean of its divisors is an integer number (314834016).

Almost surely, 2^21323303232 is an apocalyptic number.

21323303232 is a gapful number since it is divisible by the number (22) 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 21323303232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35261409792).

21323303232 is an abundant number, since it is smaller than the sum of its proper divisors (49199516352).

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

21323303232 is a wasteful number, since it uses less digits than its factorization.

21323303232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3797 (or 3787 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 24.

Adding to 21323303232 its reverse (23230332312), we get a palindrome (44553635544).

The spelling of 21323303232 in words is "twenty-one billion, three hundred twenty-three million, three hundred three thousand, two hundred thirty-two".