121842 has 24 divisors (see below), whose sum is σ = 302016. Its totient is φ = 34776.

The previous prime is 121789. The next prime is 121843. The reversal of 121842 is 248121.

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

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 121842.

It is not an unprimeable number, because it can be changed into a prime (121843) 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, 358 + ... + 609.

It is an arithmetic number, because the mean of its divisors is an integer number (12584).

2¹²¹⁸⁴² is an apocalyptic number.

121842 is an abundant number, since it is smaller than the sum of its proper divisors (180174).

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

121842 is a wasteful number, since it uses less digits than its factorization.

121842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 982 (or 979 counting only the distinct ones).

The product of its digits is 128, while the sum is 18.

The square root of 121842 is about 349.0587343127. The cubic root of 121842 is about 49.5753367672.

Adding to 121842 its reverse (248121), we get a palindrome (369963).

The spelling of 121842 in words is "one hundred twenty-one thousand, eight hundred forty-two".