12321666 has 64 divisors (see below), whose sum is σ = 32175360. Its totient is φ = 3421440.

The previous prime is 12321653. The next prime is 12321679. The reversal of 12321666 is 66612321.

It is an interprime number because it is at equal distance from previous prime (12321653) and next prime (12321679).

It is a Harshad number since it is a multiple of its sum of digits (27).

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

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13546 + ... + 14426.

It is an arithmetic number, because the mean of its divisors is an integer number (502740).

Almost surely, 2^12321666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12321666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16087680).

12321666 is an abundant number, since it is smaller than the sum of its proper divisors (19853694).

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

12321666 is a wasteful number, since it uses less digits than its factorization.

12321666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 936 (or 930 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 12321666 is about 3510.2230698347. The cubic root of 12321666 is about 230.9704802892.

Adding to 12321666 its reverse (66612321), we get a palindrome (78933987).

The spelling of 12321666 in words is "twelve million, three hundred twenty-one thousand, six hundred sixty-six".