21113424224 has 48 divisors (see below), whose sum is σ = 42539406336. Its totient is φ = 10310697600.

The previous prime is 21113424217. The next prime is 21113424239. The reversal of 21113424224 is 42242431112.

It is a super-3 number, since 3×21113424224³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21113424193 and 21113424202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 724169 + ... + 752759.

It is an arithmetic number, because the mean of its divisors is an integer number (886237632).

Almost surely, 2^21113424224 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 21113424224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21269703168).

21113424224 is an abundant number, since it is smaller than the sum of its proper divisors (21425982112).

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

21113424224 is a wasteful number, since it uses less digits than its factorization.

21113424224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29139 (or 29131 counting only the distinct ones).

The product of its digits is 3072, while the sum is 26.

Adding to 21113424224 its reverse (42242431112), we get a palindrome (63355855336).

The spelling of 21113424224 in words is "twenty-one billion, one hundred thirteen million, four hundred twenty-four thousand, two hundred twenty-four".