21323223222 has 64 divisors (see below), whose sum is σ = 49845196800. Its totient is φ = 5955580800.

The previous prime is 21323223193. The next prime is 21323223253. The reversal of 21323223222 is 22232232312.

It is a super-2 number, since 2×21323223222² (a number of 21 digits) contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 21323223192 and 21323223201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 303304 + ... + 366932.

It is an arithmetic number, because the mean of its divisors is an integer number (778831200).

Almost surely, 2^21323223222 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21323223222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24922598400).

21323223222 is an abundant number, since it is smaller than the sum of its proper divisors (28521973578).

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

21323223222 is a wasteful number, since it uses less digits than its factorization.

21323223222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63821.

The product of its digits is 3456, while the sum is 24.

Adding to 21323223222 its reverse (22232232312), we get a palindrome (43555455534).

The spelling of 21323223222 in words is "twenty-one billion, three hundred twenty-three million, two hundred twenty-three thousand, two hundred twenty-two".