121039128 has 192 divisors, whose sum is σ = 396165120. Its totient is φ = 32659200.

The previous prime is 121039123. The next prime is 121039129. The reversal of 121039128 is 821930121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121039123) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 953001 + ... + 953127.

It is an arithmetic number, because the mean of its divisors is an integer number (2063360).

Almost surely, 2^121039128 is an apocalyptic number.

121039128 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 121039128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (198082560).

121039128 is an abundant number, since it is smaller than the sum of its proper divisors (275125992).

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

121039128 is a wasteful number, since it uses less digits than its factorization.

121039128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238 (or 231 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 121039128 is about 11001.7784016949. The cubic root of 121039128 is about 494.6620527691.

Adding to 121039128 its reverse (821930121), we get a palindrome (942969249).

The spelling of 121039128 in words is "one hundred twenty-one million, thirty-nine thousand, one hundred twenty-eight".