121507128 has 160 divisors (see below), whose sum is σ = 365904000. Its totient is φ = 37558080.

The previous prime is 121507117. The next prime is 121507157. The reversal of 121507128 is 821705121.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 874083 + ... + 874221.

It is an arithmetic number, because the mean of its divisors is an integer number (2286900).

Almost surely, 2^121507128 is an apocalyptic number.

121507128 is a gapful number since it is divisible by the number (18) 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 121507128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (182952000).

121507128 is an abundant number, since it is smaller than the sum of its proper divisors (244396872).

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

121507128 is a wasteful number, since it uses less digits than its factorization.

121507128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247 (or 234 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 27.

The square root of 121507128 is about 11023.0271704283. The cubic root of 121507128 is about 495.2987727981.

The spelling of 121507128 in words is "one hundred twenty-one million, five hundred seven thousand, one hundred twenty-eight".