12111221120220 has 144 divisors (see below), whose sum is σ = 37108346315040. Its totient is φ = 3197166336000.

The previous prime is 12111221120213. The next prime is 12111221120231. The reversal of 12111221120220 is 2202112211121.

12111221120220 is a `hidden beast` number, since 1 + 211 + 1 + 2 + 211 + 20 + 220 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 12111221120193 and 12111221120202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9016320 + ... + 10272120.

It is an arithmetic number, because the mean of its divisors is an integer number (257696849410).

Almost surely, 2^{12111221120220} is an apocalyptic number.

12111221120220 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 12111221120220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18554173157520).

12111221120220 is an abundant number, since it is smaller than the sum of its proper divisors (24997125194820).

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

12111221120220 is a wasteful number, since it uses less digits than its factorization.

12111221120220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1256356 (or 1256351 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 12111221120220 its reverse (2202112211121), we get a palindrome (14313333331341).

The spelling of 12111221120220 in words is "twelve trillion, one hundred eleven billion, two hundred twenty-one million, one hundred twenty thousand, two hundred twenty".