12231121 has 4 divisors (see below), whose sum is σ = 13978432. Its totient is φ = 10483812.

The previous prime is 12231083. The next prime is 12231133. The reversal of 12231121 is 12113221.

12231121 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 a cyclic number.

It is not a de Polignac number, because 12231121 - 2⁷ = 12230993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12231521) 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, 873645 + ... + 873658.

It is an arithmetic number, because the mean of its divisors is an integer number (3494608).

Almost surely, 2^12231121 is an apocalyptic number.

It is an amenable number.

12231121 is a deficient number, since it is larger than the sum of its proper divisors (1747311).

12231121 is an equidigital number, since it uses as much as digits as its factorization.

12231121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1747310.

The product of its digits is 24, while the sum is 13.

The square root of 12231121 is about 3497.3019600829. The cubic root of 12231121 is about 230.4033313662.

Adding to 12231121 its reverse (12113221), we get a palindrome (24344342).

The spelling of 12231121 in words is "twelve million, two hundred thirty-one thousand, one hundred twenty-one".