121128930 has 48 divisors (see below), whose sum is σ = 339164280. Its totient is φ = 29816064.

The previous prime is 121128919. The next prime is 121128937. The reversal of 121128930 is 39821121.

It can be written as a sum of positive squares in 4 ways, for example, as 40182921 + 80946009 = 6339^2 + 8997^2 .

It is a junction number, because it is equal to n+sod(n) for n = 121128894 and 121128903.

It is not an unprimeable number, because it can be changed into a prime (121128937) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 50595 + ... + 52934.

Almost surely, 2^121128930 is an apocalyptic number.

121128930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121128930 is an abundant number, since it is smaller than the sum of its proper divisors (218035350).

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

121128930 is a wasteful number, since it uses less digits than its factorization.

121128930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103555 (or 103552 counting only the distinct ones).

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

The square root of 121128930 is about 11005.8588942436. The cubic root of 121128930 is about 494.7843566364.

The spelling of 121128930 in words is "one hundred twenty-one million, one hundred twenty-eight thousand, nine hundred thirty".