12122221111220 has 48 divisors (see below), whose sum is σ = 27771247078848. Its totient is φ = 4408026351360.

The previous prime is 12122221111219. The next prime is 12122221111223. The reversal of 12122221111220 is 2211112222121.

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 = 12122221111192 and 12122221111201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12122221111223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20581667 + ... + 21162453.

It is an arithmetic number, because the mean of its divisors is an integer number (578567647476).

Almost surely, 2^{12122221111220} is an apocalyptic number.

12122221111220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12122221111220 is an abundant number, since it is smaller than the sum of its proper divisors (15649025967628).

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

12122221111220 is a wasteful number, since it uses less digits than its factorization.

12122221111220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 675680 (or 675678 counting only the distinct ones).

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

Adding to 12122221111220 its reverse (2211112222121), we get a palindrome (14333333333341).

The spelling of 12122221111220 in words is "twelve trillion, one hundred twenty-two billion, two hundred twenty-one million, one hundred eleven thousand, two hundred twenty".