121158 has 24 divisors (see below), whose sum is σ = 269568. Its totient is φ = 39312.

The previous prime is 121157. The next prime is 121169. The reversal of 121158 is 851121.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nialpdrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 121158.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121151) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 891 + ... + 1017.

It is an arithmetic number, because the mean of its divisors is an integer number (11232).

2¹²¹¹⁵⁸ is an apocalyptic number.

121158 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

121158 is an abundant number, since it is smaller than the sum of its proper divisors (148410).

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

121158 is a wasteful number, since it uses less digits than its factorization.

121158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188 (or 185 counting only the distinct ones).

The product of its digits is 80, while the sum is 18.

The square root of 121158 is about 348.0775775599. The cubic root of 121158 is about 49.4823934935.

Adding to 121158 its reverse (851121), we get a palindrome (972279).

The spelling of 121158 in words is "one hundred twenty-one thousand, one hundred fifty-eight".