21330012320 has 96 divisors (see below), whose sum is σ = 52878510720. Its totient is φ = 8115205120.

The previous prime is 21330012239. The next prime is 21330012367. The reversal of 21330012320 is 2321003312.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 642530 + ... + 674910.

It is an arithmetic number, because the mean of its divisors is an integer number (550817820).

Almost surely, 2^21330012320 is an apocalyptic number.

21330012320 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 21330012320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26439255360).

21330012320 is an abundant number, since it is smaller than the sum of its proper divisors (31548498400).

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

21330012320 is a wasteful number, since it uses less digits than its factorization.

21330012320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32598 (or 32590 counting only the distinct ones).

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

Adding to 21330012320 its reverse (2321003312), we get a palindrome (23651015632).

The spelling of 21330012320 in words is "twenty-one billion, three hundred thirty million, twelve thousand, three hundred twenty".