12321231 has 16 divisors (see below), whose sum is σ = 17879904. Its totient is φ = 7501824.

The previous prime is 12321227. The next prime is 12321241. The reversal of 12321231 is 13212321.

12321231 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 12321231 - 2² = 12321227 is a prime.

It is a super-2 number, since 2×12321231² = 303625466710722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12321231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12321241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2155 + ... + 5411.

It is an arithmetic number, because the mean of its divisors is an integer number (1117494).

It is the magic constant of a 291 × 291 magic square.

Almost surely, 2^12321231 is an apocalyptic number.

12321231 is a deficient number, since it is larger than the sum of its proper divisors (5558673).

12321231 is a wasteful number, since it uses less digits than its factorization.

12321231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3370.

The product of its digits is 72, while the sum is 15.

The square root of 12321231 is about 3510.1611074137. The cubic root of 12321231 is about 230.9677622222.

Adding to 12321231 its reverse (13212321), we get a palindrome (25533552).

It can be divided in two parts, 1 and 2321231, that added together give a palindrome (2321232).

The spelling of 12321231 in words is "twelve million, three hundred twenty-one thousand, two hundred thirty-one".