12111101220 has 192 divisors, whose sum is σ = 37928620800. Its totient is φ = 2874009600.

The previous prime is 12111101213. The next prime is 12111101227. The reversal of 12111101220 is 2210111121.

It is an interprime number because it is at equal distance from previous prime (12111101213) and next prime (12111101227).

It is a super-2 number, since 2×12111101220² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 12111101196 and 12111101205.

It is not an unprimeable number, because it can be changed into a prime (12111101227) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1218270 + ... + 1228170.

It is an arithmetic number, because the mean of its divisors is an integer number (197544900).

Almost surely, 2^12111101220 is an apocalyptic number.

12111101220 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 12111101220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18964310400).

12111101220 is an abundant number, since it is smaller than the sum of its proper divisors (25817519580).

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

12111101220 is a wasteful number, since it uses less digits than its factorization.

12111101220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9998 (or 9996 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 12111101220 its reverse (2210111121), we get a palindrome (14321212341).

Subtracting from 12111101220 its reverse (2210111121), we obtain a palindrome (9900990099).

The spelling of 12111101220 in words is "twelve billion, one hundred eleven million, one hundred one thousand, two hundred twenty".