21221322332 has 48 divisors (see below), whose sum is σ = 43485361920. Its totient is φ = 8871956352.

The previous prime is 21221322329. The next prime is 21221322341. The reversal of 21221322332 is 23322312212.

It is a junction number, because it is equal to n+sod(n) for n = 21221322298 and 21221322307.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 963143 + ... + 984929.

It is an arithmetic number, because the mean of its divisors is an integer number (905945040).

Almost surely, 2^21221322332 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 21221322332, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21742680960).

21221322332 is an abundant number, since it is smaller than the sum of its proper divisors (22264039588).

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

21221322332 is a wasteful number, since it uses less digits than its factorization.

21221322332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22650 (or 22648 counting only the distinct ones).

The product of its digits is 1728, while the sum is 23.

Adding to 21221322332 its reverse (23322312212), we get a palindrome (44543634544).

The spelling of 21221322332 in words is "twenty-one billion, two hundred twenty-one million, three hundred twenty-two thousand, three hundred thirty-two".