22212111220 has 48 divisors (see below), whose sum is σ = 50320943568. Its totient is φ = 8187125760.

The previous prime is 22212111211. The next prime is 22212111221. The reversal of 22212111220 is 2211121222.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 169364196 + 22042747024 = 13014^2 + 148468^2 .

It is a junction number, because it is equal to n+sod(n) for n = 22212111194 and 22212111203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22212111221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75990 + ... + 224050.

It is an arithmetic number, because the mean of its divisors is an integer number (1048352991).

Almost surely, 2^22212111220 is an apocalyptic number.

22212111220 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 22212111220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25160471784).

22212111220 is an abundant number, since it is smaller than the sum of its proper divisors (28108832348).

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

22212111220 is a wasteful number, since it uses less digits than its factorization.

22212111220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148660 (or 148658 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 22212111220 its reverse (2211121222), we get a palindrome (24423232442).

The spelling of 22212111220 in words is "twenty-two billion, two hundred twelve million, one hundred eleven thousand, two hundred twenty".