21330323020 has 96 divisors (see below), whose sum is σ = 49816166400. Its totient is φ = 7638107904.

The previous prime is 21330322987. The next prime is 21330323023. The reversal of 21330323020 is 2032303312.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is not an unprimeable number, because it can be changed into a prime (21330323023) 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, 497349 + ... + 538531.

It is an arithmetic number, because the mean of its divisors is an integer number (518918400).

Almost surely, 2^21330323020 is an apocalyptic number.

21330323020 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 21330323020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24908083200).

21330323020 is an abundant number, since it is smaller than the sum of its proper divisors (28485843380).

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

21330323020 is a wasteful number, since it uses less digits than its factorization.

21330323020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41287 (or 41285 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 19.

Adding to 21330323020 its reverse (2032303312), we get a palindrome (23362626332).

The spelling of 21330323020 in words is "twenty-one billion, three hundred thirty million, three hundred twenty-three thousand, twenty".