21223223224 has 64 divisors (see below), whose sum is σ = 47020861440. Its totient is φ = 8788106880.

The previous prime is 21223223213. The next prime is 21223223261. The reversal of 21223223224 is 42232232212.

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, 1106742 + ... + 1125754.

It is an arithmetic number, because the mean of its divisors is an integer number (734700960).

Almost surely, 2^21223223224 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 21223223224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23510430720).

21223223224 is an abundant number, since it is smaller than the sum of its proper divisors (25797638216).

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

21223223224 is a wasteful number, since it uses less digits than its factorization.

21223223224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19700 (or 19696 counting only the distinct ones).

The product of its digits is 4608, while the sum is 25.

Adding to 21223223224 its reverse (42232232212), we get a palindrome (63455455436).

The spelling of 21223223224 in words is "twenty-one billion, two hundred twenty-three million, two hundred twenty-three thousand, two hundred twenty-four".