12131240220 has 144 divisors (see below), whose sum is σ = 40230328320. Its totient is φ = 2934537600.

The previous prime is 12131240203. The next prime is 12131240227. The reversal of 12131240220 is 2204213121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 12131240193 and 12131240202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12131240227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 942025 + ... + 954815.

It is an arithmetic number, because the mean of its divisors is an integer number (279377280).

Almost surely, 2^12131240220 is an apocalyptic number.

12131240220 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 12131240220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20115164160).

12131240220 is an abundant number, since it is smaller than the sum of its proper divisors (28099088100).

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

12131240220 is a wasteful number, since it uses less digits than its factorization.

12131240220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13296 (or 13291 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 12131240220 its reverse (2204213121), we get a palindrome (14335453341).

The spelling of 12131240220 in words is "twelve billion, one hundred thirty-one million, two hundred forty thousand, two hundred twenty".