12212111221220 has 96 divisors (see below), whose sum is σ = 26339765760000. Its totient is φ = 4753471895424.

The previous prime is 12212111221187. The next prime is 12212111221237. The reversal of 12212111221220 is 2212211121221.

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 = 12212111221192 and 12212111221201.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 251880941 + ... + 251929419.

It is an arithmetic number, because the mean of its divisors is an integer number (274372560000).

Almost surely, 2^{12212111221220} is an apocalyptic number.

12212111221220 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 12212111221220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13169882880000).

12212111221220 is an abundant number, since it is smaller than the sum of its proper divisors (14127654538780).

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

12212111221220 is a wasteful number, since it uses less digits than its factorization.

12212111221220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49617 (or 49615 counting only the distinct ones).

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

Adding to 12212111221220 its reverse (2212211121221), we get a palindrome (14424322342441).

Subtracting from 12212111221220 its reverse (2212211121221), we obtain a palindrome (9999900099999).

The spelling of 12212111221220 in words is "twelve trillion, two hundred twelve billion, one hundred eleven million, two hundred twenty-one thousand, two hundred twenty".