120121200128 has 20 divisors (see below), whose sum is σ = 240007789560. Its totient is φ = 60060599808.

The previous prime is 120121200127. The next prime is 120121200149. The reversal of 120121200128 is 821002121021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120121200127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 117305348 + ... + 117306371.

It is an arithmetic number, because the mean of its divisors is an integer number (12000389478).

Almost surely, 2^120121200128 is an apocalyptic number.

It is an amenable number.

120121200128 is a deficient number, since it is larger than the sum of its proper divisors (119886589432).

120121200128 is an frugal number, since it uses more digits than its factorization.

120121200128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234611737 (or 234611721 counting only the distinct ones).

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

Adding to 120121200128 its reverse (821002121021), we get a palindrome (941123321149).

The spelling of 120121200128 in words is "one hundred twenty billion, one hundred twenty-one million, two hundred thousand, one hundred twenty-eight".