12321111220 has 48 divisors (see below), whose sum is σ = 28235946816. Its totient is φ = 4478912000.

The previous prime is 12321111211. The next prime is 12321111227. The reversal of 12321111220 is 2211112321.

It is a junction number, because it is equal to n+sod(n) for n = 12321111194 and 12321111203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12321111227) 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 15 ways as a sum of consecutive naturals, for example, 819975 + ... + 834865.

It is an arithmetic number, because the mean of its divisors is an integer number (588248892).

Almost surely, 2^12321111220 is an apocalyptic number.

12321111220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12321111220 is an abundant number, since it is smaller than the sum of its proper divisors (15914835596).

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

12321111220 is a wasteful number, since it uses less digits than its factorization.

12321111220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18672 (or 18670 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 12321111220 its reverse (2211112321), we get a palindrome (14532223541).

It can be divided in two parts, 123211 and 11220, that added together give a palindrome (134431).

The spelling of 12321111220 in words is "twelve billion, three hundred twenty-one million, one hundred eleven thousand, two hundred twenty".