121353128 has 16 divisors (see below), whose sum is σ = 245040180. Its totient is φ = 56009088.

The previous prime is 121353119. The next prime is 121353173. The reversal of 121353128 is 821353121.

It can be written as a sum of positive squares in 2 ways, for example, as 110712484 + 10640644 = 10522^2 + 3262^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a junction number, because it is equal to n+sod(n) for n = 121353097 and 121353106.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 583325 + ... + 583532.

Almost surely, 2^121353128 is an apocalyptic number.

It is an amenable number.

121353128 is an abundant number, since it is smaller than the sum of its proper divisors (123687052).

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

121353128 is a wasteful number, since it uses less digits than its factorization.

121353128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1166876 (or 1166872 counting only the distinct ones).

The product of its digits is 1440, while the sum is 26.

The square root of 121353128 is about 11016.0395787234. The cubic root of 121353128 is about 495.0894345767.

The spelling of 121353128 in words is "one hundred twenty-one million, three hundred fifty-three thousand, one hundred twenty-eight".