22122223220 has 48 divisors (see below), whose sum is σ = 47765846016. Its totient is φ = 8601120000.

The previous prime is 22122223177. The next prime is 22122223259. The reversal of 22122223220 is 2232222122.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 22122223192 and 22122223201.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 172445 + ... + 271995.

It is an arithmetic number, because the mean of its divisors is an integer number (995121792).

Almost surely, 2^22122223220 is an apocalyptic number.

22122223220 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 22122223220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23882923008).

22122223220 is an abundant number, since it is smaller than the sum of its proper divisors (25643622796).

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

22122223220 is a wasteful number, since it uses less digits than its factorization.

22122223220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99872 (or 99870 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 22122223220 its reverse (2232222122), we get a palindrome (24354445342).

It can be divided in two parts, 221222 and 23220, that added together give a palindrome (244442).

The spelling of 22122223220 in words is "twenty-two billion, one hundred twenty-two million, two hundred twenty-three thousand, two hundred twenty".