21303232320 has 112 divisors (see below), whose sum is σ = 67827265920. Its totient is φ = 5664946176.

The previous prime is 21303232319. The next prime is 21303232343. The reversal of 21303232320 is 2323230312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 313734 + ... + 375546.

Almost surely, 2^21303232320 is an apocalyptic number.

21303232320 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 21303232320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33913632960).

21303232320 is an abundant number, since it is smaller than the sum of its proper divisors (46524033600).

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

21303232320 is a wasteful number, since it uses less digits than its factorization.

21303232320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62192 (or 62182 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 21.

Adding to 21303232320 its reverse (2323230312), we get a palindrome (23626462632).

The spelling of 21303232320 in words is "twenty-one billion, three hundred three million, two hundred thirty-two thousand, three hundred twenty".