21320024412 has 96 divisors (see below), whose sum is σ = 54429984000. Its totient is φ = 6471539712.

The previous prime is 21320024359. The next prime is 21320024437. The reversal of 21320024412 is 21442002312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 684964 + ... + 715412.

It is an arithmetic number, because the mean of its divisors is an integer number (566979000).

Almost surely, 2^21320024412 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 21320024412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27214992000).

21320024412 is an abundant number, since it is smaller than the sum of its proper divisors (33109959588).

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

21320024412 is a wasteful number, since it uses less digits than its factorization.

21320024412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30595 (or 30593 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 21320024412 its reverse (21442002312), we get a palindrome (42762026724).

The spelling of 21320024412 in words is "twenty-one billion, three hundred twenty million, twenty-four thousand, four hundred twelve".