842121 has 12 divisors (see below), whose sum is σ = 1390272. Its totient is φ = 481176.

The previous prime is 842113. The next prime is 842141. The reversal of 842121 is 121248.

842121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 842121 - 2³ = 842113 is a prime.

842121 is a modest number, since divided by 2121 gives 84 as remainder.

842121 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 842094 and 842103.

It is not an unprimeable number, because it can be changed into a prime (842111) 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, 6621 + ... + 6746.

It is an arithmetic number, because the mean of its divisors is an integer number (115856).

2⁸⁴²¹²¹ is an apocalyptic number.

It is an amenable number.

842121 is a deficient number, since it is larger than the sum of its proper divisors (548151).

842121 is a wasteful number, since it uses less digits than its factorization.

842121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13380 (or 13377 counting only the distinct ones).

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

The square root of 842121 is about 917.6715098552. The cubic root of 842121 is about 94.4332273747.

Adding to 842121 its reverse (121248), we get a palindrome (963369).

The spelling of 842121 in words is "eight hundred forty-two thousand, one hundred twenty-one".