12231312 has 80 divisors (see below), whose sum is σ = 33247872. Its totient is φ = 3870720.

The previous prime is 12231311. The next prime is 12231367. The reversal of 12231312 is 21313221.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 12231291 and 12231300.

It is not an unprimeable number, because it can be changed into a prime (12231311) 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, 126048 + ... + 126144.

Almost surely, 2^12231312 is an apocalyptic number.

12231312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12231312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16623936).

12231312 is an abundant number, since it is smaller than the sum of its proper divisors (21016560).

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

12231312 is a wasteful number, since it uses less digits than its factorization.

12231312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216 (or 210 counting only the distinct ones).

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

The square root of 12231312 is about 3497.3292667406. The cubic root of 12231312 is about 230.4045306787.

Adding to 12231312 its reverse (21313221), we get a palindrome (33544533).

The spelling of 12231312 in words is "twelve million, two hundred thirty-one thousand, three hundred twelve".