21333224224 has 108 divisors (see below), whose sum is σ = 47548754946. Its totient is φ = 9416749056.

The previous prime is 21333224183. The next prime is 21333224249. The reversal of 21333224224 is 42242233312.

It can be written as a sum of positive squares in 3 ways, for example, as 8548851600 + 12784372624 = 92460^2 + 113068^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21333224192 and 21333224201.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2857104 + ... + 2864560.

Almost surely, 2^21333224224 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 21333224224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23774377473).

21333224224 is an abundant number, since it is smaller than the sum of its proper divisors (26215530722).

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

21333224224 is a wasteful number, since it uses less digits than its factorization.

21333224224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7539 (or 7495 counting only the distinct ones).

The product of its digits is 13824, while the sum is 28.

Adding to 21333224224 its reverse (42242233312), we get a palindrome (63575457536).

The spelling of 21333224224 in words is "twenty-one billion, three hundred thirty-three million, two hundred twenty-four thousand, two hundred twenty-four".