120128220 has 36 divisors (see below), whose sum is σ = 364389480. Its totient is φ = 32034144.

The previous prime is 120128213. The next prime is 120128227. The reversal of 120128220 is 22821021.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (120128213) and next prime (120128227).

It is a tau number, because it is divible by the number of its divisors (36).

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 = 120128193 and 120128202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120128227) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 333510 + ... + 333869.

It is an arithmetic number, because the mean of its divisors is an integer number (10121930).

Almost surely, 2^120128220 is an apocalyptic number.

120128220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

120128220 is an abundant number, since it is smaller than the sum of its proper divisors (244261260).

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

120128220 is a wasteful number, since it uses less digits than its factorization.

120128220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 667394 (or 667389 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 120128220 is about 10960.3020031384. The cubic root of 120128220 is about 493.4180288399.

Adding to 120128220 its reverse (22821021), we get a palindrome (142949241).

The spelling of 120128220 in words is "one hundred twenty million, one hundred twenty-eight thousand, two hundred twenty".