120131220 has 72 divisors (see below), whose sum is σ = 369748512. Its totient is φ = 29120960.

The previous prime is 120131213. The next prime is 120131227. The reversal of 120131220 is 22131021.

It is an interprime number because it is at equal distance from previous prime (120131213) and next prime (120131227).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 120131196 and 120131205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120131227) 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, 1014 + ... + 15533.

It is an arithmetic number, because the mean of its divisors is an integer number (5135396).

Almost surely, 2^120131220 is an apocalyptic number.

120131220 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 120131220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (184874256).

120131220 is an abundant number, since it is smaller than the sum of its proper divisors (249617292).

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

120131220 is a wasteful number, since it uses less digits than its factorization.

120131220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16581 (or 16568 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 120131220 is about 10960.4388598267. The cubic root of 120131220 is about 493.4221362338.

Adding to 120131220 its reverse (22131021), we get a palindrome (142262241).

The spelling of 120131220 in words is "one hundred twenty million, one hundred thirty-one thousand, two hundred twenty".