21232223320 has 144 divisors (see below), whose sum is σ = 61084059120. Its totient is φ = 6617761920.

The previous prime is 21232223317. The next prime is 21232223377. The reversal of 21232223320 is 2332223212.

It is a super-2 number, since 2×21232223320² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 21232223291 and 21232223300.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 192397 + ... + 281923.

It is an arithmetic number, because the mean of its divisors is an integer number (424194855).

Almost surely, 2^21232223320 is an apocalyptic number.

21232223320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21232223320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30542029560).

21232223320 is an abundant number, since it is smaller than the sum of its proper divisors (39851835800).

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

21232223320 is a wasteful number, since it uses less digits than its factorization.

21232223320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89574 (or 89552 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 22.

Adding to 21232223320 its reverse (2332223212), we get a palindrome (23564446532).

The spelling of 21232223320 in words is "twenty-one billion, two hundred thirty-two million, two hundred twenty-three thousand, three hundred twenty".