21302232224 has 96 divisors (see below), whose sum is σ = 52024283136. Its totient is φ = 8360755200.

The previous prime is 21302232163. The next prime is 21302232241. The reversal of 21302232224 is 42223220312.

It is a self number, because there is not a number n which added to its sum of digits gives 21302232224.

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, 341024 + ... + 398624.

It is an arithmetic number, because the mean of its divisors is an integer number (541919616).

Almost surely, 2^21302232224 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 21302232224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26012141568).

21302232224 is an abundant number, since it is smaller than the sum of its proper divisors (30722050912).

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

21302232224 is a wasteful number, since it uses less digits than its factorization.

21302232224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57758 (or 57750 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 23.

Adding to 21302232224 its reverse (42223220312), we get a palindrome (63525452536).

The spelling of 21302232224 in words is "twenty-one billion, three hundred two million, two hundred thirty-two thousand, two hundred twenty-four".