21120344424224 has 96 divisors (see below), whose sum is σ = 42712645610880. Its totient is φ = 10276171776000.

The previous prime is 21120344424203. The next prime is 21120344424239. The reversal of 21120344424224 is 42242444302112.

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, 164093207 + ... + 164221865.

It is an arithmetic number, because the mean of its divisors is an integer number (444923391780).

Almost surely, 2^{21120344424224} 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 21120344424224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21356322805440).

21120344424224 is an abundant number, since it is smaller than the sum of its proper divisors (21592301186656).

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

21120344424224 is a wasteful number, since it uses less digits than its factorization.

21120344424224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129514 (or 129506 counting only the distinct ones).

The product of its (nonzero) digits is 98304, while the sum is 35.

Adding to 21120344424224 its reverse (42242444302112), we get a palindrome (63362788726336).

The spelling of 21120344424224 in words is "twenty-one trillion, one hundred twenty billion, three hundred forty-four million, four hundred twenty-four thousand, two hundred twenty-four".