21321324222 has 64 divisors (see below), whose sum is σ = 47852640000. Its totient is φ = 6276372480.

The previous prime is 21321324217. The next prime is 21321324223. The reversal of 21321324222 is 22242312312.

It is a junction number, because it is equal to n+sod(n) for n = 21321324192 and 21321324201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21321324223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1602654 + ... + 1615902.

It is an arithmetic number, because the mean of its divisors is an integer number (747697500).

Almost surely, 2^21321324222 is an apocalyptic number.

21321324222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 21321324222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23926320000).

21321324222 is an abundant number, since it is smaller than the sum of its proper divisors (26531315778).

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

21321324222 is a wasteful number, since it uses less digits than its factorization.

21321324222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13961.

The product of its digits is 2304, while the sum is 24.

Adding to 21321324222 its reverse (22242312312), we get a palindrome (43563636534).

It can be divided in two parts, 21321 and 324222, that added together give a palindrome (345543).

The spelling of 21321324222 in words is "twenty-one billion, three hundred twenty-one million, three hundred twenty-four thousand, two hundred twenty-two".