21113013024 has 144 divisors (see below), whose sum is σ = 62760664512. Its totient is φ = 6719860224.

The previous prime is 21113013013. The next prime is 21113013037. The reversal of 21113013024 is 42031031112.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21113012988 and 21113013006.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4256754 + ... + 4261710.

It is an arithmetic number, because the mean of its divisors is an integer number (435837948).

Almost surely, 2^21113013024 is an apocalyptic number.

21113013024 is a gapful number since it is divisible by the number (24) 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 21113013024, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31380332256).

21113013024 is an abundant number, since it is smaller than the sum of its proper divisors (41647651488).

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

21113013024 is a wasteful number, since it uses less digits than its factorization.

21113013024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5639 (or 5628 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21113013024 its reverse (42031031112), we get a palindrome (63144044136).

The spelling of 21113013024 in words is "twenty-one billion, one hundred thirteen million, thirteen thousand, twenty-four".