12021666 has 8 divisors (see below), whose sum is σ = 24043344. Its totient is φ = 4007220.

The previous prime is 12021641. The next prime is 12021671. The reversal of 12021666 is 66612021.

It is a sphenic number, since it is the product of 3 distinct primes.

12021666 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1001800 + ... + 1001811.

It is an arithmetic number, because the mean of its divisors is an integer number (3005418).

Almost surely, 2^12021666 is an apocalyptic number.

12021666 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

12021666 is a wasteful number, since it uses less digits than its factorization.

12021666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2003616.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 12021666 is about 3467.2274225958. The cubic root of 12021666 is about 229.0805511075.

Adding to 12021666 its reverse (66612021), we get a palindrome (78633687).

The spelling of 12021666 in words is "twelve million, twenty-one thousand, six hundred sixty-six".