12122212111220 has 96 divisors (see below), whose sum is σ = 27903119086080. Its totient is φ = 4403195955200.

The previous prime is 12122212111199. The next prime is 12122212111267. The reversal of 12122212111220 is 2211121222121.

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 = 12122212111192 and 12122212111201.

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, 13639445 + ... + 14500995.

It is an arithmetic number, because the mean of its divisors is an integer number (290657490480).

Almost surely, 2^{12122212111220} is an apocalyptic number.

12122212111220 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 12122212111220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13951559543040).

12122212111220 is an abundant number, since it is smaller than the sum of its proper divisors (15780906974860).

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

12122212111220 is a wasteful number, since it uses less digits than its factorization.

12122212111220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 863033 (or 863031 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 12122212111220 its reverse (2211121222121), we get a palindrome (14333333333341).

The spelling of 12122212111220 in words is "twelve trillion, one hundred twenty-two billion, two hundred twelve million, one hundred eleven thousand, two hundred twenty".