12212111220 has 96 divisors (see below), whose sum is σ = 35153521536. Its totient is φ = 3165350400.

The previous prime is 12212111209. The next prime is 12212111221. The reversal of 12212111220 is 2211121221.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 12212111220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12212111221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2863890 + ... + 2868150.

It is an arithmetic number, because the mean of its divisors is an integer number (366182516).

Almost surely, 2^12212111220 is an apocalyptic number.

12212111220 is a gapful number since it is divisible by the number (10) 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 12212111220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17576760768).

12212111220 is an abundant number, since it is smaller than the sum of its proper divisors (22941410316).

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

12212111220 is a wasteful number, since it uses less digits than its factorization.

12212111220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5601 (or 5599 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 12212111220 its reverse (2211121221), we get a palindrome (14423232441).

The spelling of 12212111220 in words is "twelve billion, two hundred twelve million, one hundred eleven thousand, two hundred twenty".