12220131220 has 72 divisors (see below), whose sum is σ = 28670055624. Its totient is φ = 4370784000.

The previous prime is 12220131137. The next prime is 12220131227. The reversal of 12220131220 is 2213102221.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 494706564 + 11725424656 = 22242^2 + 108284^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12220131194 and 12220131203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12220131227) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 106230 + ... + 189010.

It is an arithmetic number, because the mean of its divisors is an integer number (398195217).

Almost surely, 2^12220131220 is an apocalyptic number.

12220131220 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 12220131220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14335027812).

12220131220 is an abundant number, since it is smaller than the sum of its proper divisors (16449924404).

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

12220131220 is a wasteful number, since it uses less digits than its factorization.

12220131220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82873 (or 82860 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 12220131220 its reverse (2213102221), we get a palindrome (14433233441).

The spelling of 12220131220 in words is "twelve billion, two hundred twenty million, one hundred thirty-one thousand, two hundred twenty".