21332120320 has 144 divisors (see below), whose sum is σ = 58787140608. Its totient is φ = 7264972800.

The previous prime is 21332120317. The next prime is 21332120321. The reversal of 21332120320 is 2302123312.

It is not an unprimeable number, because it can be changed into a prime (21332120321) 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, 1345077 + ... + 1360843.

It is an arithmetic number, because the mean of its divisors is an integer number (408244032).

Almost surely, 2^21332120320 is an apocalyptic number.

21332120320 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 21332120320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29393570304).

21332120320 is an abundant number, since it is smaller than the sum of its proper divisors (37455020288).

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

21332120320 is a wasteful number, since it uses less digits than its factorization.

21332120320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15946 (or 15932 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21332120320 its reverse (2302123312), we get a palindrome (23634243632).

The spelling of 21332120320 in words is "twenty-one billion, three hundred thirty-two million, one hundred twenty thousand, three hundred twenty".