22220311212 has 144 divisors (see below), whose sum is σ = 64335398400. Its totient is φ = 6403985280.

The previous prime is 22220311097. The next prime is 22220311271. The reversal of 22220311212 is 21211302222.

It is a Harshad number since it is a multiple of its sum of digits (18).

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 47 ways as a sum of consecutive naturals, for example, 754989 + ... + 783867.

It is an arithmetic number, because the mean of its divisors is an integer number (446773600).

Almost surely, 2^22220311212 is an apocalyptic number.

22220311212 is a gapful number since it is divisible by the number (22) 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 22220311212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32167699200).

22220311212 is an abundant number, since it is smaller than the sum of its proper divisors (42115087188).

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

22220311212 is a wasteful number, since it uses less digits than its factorization.

22220311212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28996 (or 28991 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 22220311212 its reverse (21211302222), we get a palindrome (43431613434).

The spelling of 22220311212 in words is "twenty-two billion, two hundred twenty million, three hundred eleven thousand, two hundred twelve".