231121 has 4 divisors (see below), whose sum is σ = 252144. Its totient is φ = 210100.

The previous prime is 231109. The next prime is 231131. The reversal of 231121 is 121132.

231121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 231121 - 2¹⁷ = 100049 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231098 and 231107.

It is not an unprimeable number, because it can be changed into a prime (231131) 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, 10495 + ... + 10516.

It is an arithmetic number, because the mean of its divisors is an integer number (63036).

2²³¹¹²¹ is an apocalyptic number.

It is an amenable number.

231121 is a deficient number, since it is larger than the sum of its proper divisors (21023).

231121 is a wasteful number, since it uses less digits than its factorization.

231121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21022.

The product of its digits is 12, while the sum is 10.

The square root of 231121 is about 480.7504550180. The cubic root of 231121 is about 61.3686358150.

Adding to 231121 its reverse (121132), we get a palindrome (352253).

It can be divided in two parts, 2311 and 21, that added together give a palindrome (2332).

The spelling of 231121 in words is "two hundred thirty-one thousand, one hundred twenty-one".