121125855 has 16 divisors (see below), whose sum is σ = 204001920. Its totient is φ = 61200288.

The previous prime is 121125853. The next prime is 121125857. The reversal of 121125855 is 558521121.

It is an interprime number because it is at equal distance from previous prime (121125853) and next prime (121125857).

It is not a de Polignac number, because 121125855 - 2¹ = 121125853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121125853) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 212217 + ... + 212786.

It is an arithmetic number, because the mean of its divisors is an integer number (12750120).

Almost surely, 2^121125855 is an apocalyptic number.

121125855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121125855 is a deficient number, since it is larger than the sum of its proper divisors (82876065).

121125855 is a wasteful number, since it uses less digits than its factorization.

121125855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425030.

The product of its digits is 4000, while the sum is 30.

The square root of 121125855 is about 11005.7191950367. The cubic root of 121125855 is about 494.7801697071.

Adding to 121125855 its reverse (558521121), we get a palindrome (679646976).

The spelling of 121125855 in words is "one hundred twenty-one million, one hundred twenty-five thousand, eight hundred fifty-five".