121028188 has 6 divisors (see below), whose sum is σ = 211799336. Its totient is φ = 60514092.

The previous prime is 121028179. The next prime is 121028189. The reversal of 121028188 is 881820121.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121028189) 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, 15128520 + ... + 15128527.

Almost surely, 2^121028188 is an apocalyptic number.

It is an amenable number.

121028188 is a deficient number, since it is larger than the sum of its proper divisors (90771148).

121028188 is a wasteful number, since it uses less digits than its factorization.

121028188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30257051 (or 30257049 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 31.

The square root of 121028188 is about 11001.2811981151. The cubic root of 121028188 is about 494.6471491425.

The spelling of 121028188 in words is "one hundred twenty-one million, twenty-eight thousand, one hundred eighty-eight".