121128380 has 48 divisors (see below), whose sum is σ = 262918656. Its totient is φ = 46840320.

The previous prime is 121128379. The next prime is 121128433. The reversal of 121128380 is 83821121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 140912 + ... + 141768.

It is an arithmetic number, because the mean of its divisors is an integer number (5477472).

Almost surely, 2^121128380 is an apocalyptic number.

121128380 is a gapful number since it is divisible by the number (10) 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 121128380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (131459328).

121128380 is an abundant number, since it is smaller than the sum of its proper divisors (141790276).

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

121128380 is a wasteful number, since it uses less digits than its factorization.

121128380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1094 (or 1092 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 26.

The square root of 121128380 is about 11005.8339075238. The cubic root of 121128380 is about 494.7836077599.

The spelling of 121128380 in words is "one hundred twenty-one million, one hundred twenty-eight thousand, three hundred eighty".