121555112 has 16 divisors (see below), whose sum is σ = 260475360. Its totient is φ = 52095024.

The previous prime is 121555111. The next prime is 121555121. The reversal of 121555112 is 211555121.

It is not an unprimeable number, because it can be changed into a prime (121555111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1085258 + ... + 1085369.

It is an arithmetic number, because the mean of its divisors is an integer number (16279710).

Almost surely, 2^121555112 is an apocalyptic number.

It is an amenable number.

121555112 is an abundant number, since it is smaller than the sum of its proper divisors (138920248).

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

121555112 is a wasteful number, since it uses less digits than its factorization.

121555112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2170640 (or 2170636 counting only the distinct ones).

The product of its digits is 500, while the sum is 23.

The square root of 121555112 is about 11025.2034901856. The cubic root of 121555112 is about 495.3639631807.

Subtracting 121555112 from its reverse (211555121), we obtain a palindrome (90000009).

The spelling of 121555112 in words is "one hundred twenty-one million, five hundred fifty-five thousand, one hundred twelve".