21113353024 has 112 divisors (see below), whose sum is σ = 45415687680. Its totient is φ = 9714862080.

The previous prime is 21113352991. The next prime is 21113353039. The reversal of 21113353024 is 42035331112.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21113353024.

It is a congruent number.

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, 3852174 + ... + 3857650.

Almost surely, 2^21113353024 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 21113353024, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22707843840).

21113353024 is an abundant number, since it is smaller than the sum of its proper divisors (24302334656).

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

21113353024 is a wasteful number, since it uses less digits than its factorization.

21113353024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5616 (or 5606 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

Adding to 21113353024 its reverse (42035331112), we get a palindrome (63148684136).

The spelling of 21113353024 in words is "twenty-one billion, one hundred thirteen million, three hundred fifty-three thousand, twenty-four".