121300128 has 36 divisors (see below), whose sum is σ = 344948058. Its totient is φ = 40433280.

The previous prime is 121300079. The next prime is 121300129. The reversal of 121300128 is 821003121.

It can be written as a sum of positive squares in only one way, i.e., 85155984 + 36144144 = 9228^2 + 6012^2 .

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 self number, because there is not a number n which added to its sum of digits gives 121300128.

It is not an unprimeable number, because it can be changed into a prime (121300129) 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 5 ways as a sum of consecutive naturals, for example, 210303 + ... + 210878.

Almost surely, 2^121300128 is an apocalyptic number.

121300128 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

121300128 is an abundant number, since it is smaller than the sum of its proper divisors (223647930).

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

121300128 is a wasteful number, since it uses less digits than its factorization.

121300128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421197 (or 421186 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 121300128 is about 11013.6337327877. The cubic root of 121300128 is about 495.0173486420.

Adding to 121300128 its reverse (821003121), we get a palindrome (942303249).

The spelling of 121300128 in words is "one hundred twenty-one million, three hundred thousand, one hundred twenty-eight".