21320024224 has 96 divisors (see below), whose sum is σ = 45433192896. Its totient is φ = 9810677760.

The previous prime is 21320024189. The next prime is 21320024233. The reversal of 21320024224 is 42242002312.

It is a junction number, because it is equal to n+sod(n) for n = 21320024195 and 21320024204.

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, 10003639 + ... + 10005769.

It is an arithmetic number, because the mean of its divisors is an integer number (473262426).

Almost surely, 2^21320024224 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21320024224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22716596448).

21320024224 is an abundant number, since it is smaller than the sum of its proper divisors (24113168672).

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

21320024224 is a wasteful number, since it uses less digits than its factorization.

21320024224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2558 (or 2550 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

Adding to 21320024224 its reverse (42242002312), we get a palindrome (63562026536).

The spelling of 21320024224 in words is "twenty-one billion, three hundred twenty million, twenty-four thousand, two hundred twenty-four".