12111211220 has 24 divisors (see below), whose sum is σ = 25436116608. Its totient is φ = 4843994400.

The previous prime is 12111211201. The next prime is 12111211289. The reversal of 12111211220 is 2211211121.

12111211220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 12111211195 and 12111211204.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 223385 + ... + 272255.

It is an arithmetic number, because the mean of its divisors is an integer number (1059838192).

Almost surely, 2^12111211220 is an apocalyptic number.

12111211220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12111211220 is an abundant number, since it is smaller than the sum of its proper divisors (13324905388).

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

12111211220 is a wasteful number, since it uses less digits than its factorization.

12111211220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61271 (or 61269 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 12111211220 its reverse (2211211121), we get a palindrome (14322422341).

Subtracting from 12111211220 its reverse (2211211121), we obtain a palindrome (9900000099).

The spelling of 12111211220 in words is "twelve billion, one hundred eleven million, two hundred eleven thousand, two hundred twenty".