12021644 has 12 divisors (see below), whose sum is σ = 21084168. Its totient is φ = 5997600.

The previous prime is 12021641. The next prime is 12021671. The reversal of 12021644 is 44612021.

It is not an unprimeable number, because it can be changed into a prime (12021641) 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, 1097 + ... + 5024.

It is an arithmetic number, because the mean of its divisors is an integer number (1757014).

Almost surely, 2^12021644 is an apocalyptic number.

It is an amenable number.

12021644 is a deficient number, since it is larger than the sum of its proper divisors (9062524).

12021644 is a wasteful number, since it uses less digits than its factorization.

12021644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6616 (or 6614 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 12021644 is about 3467.2242500306. The cubic root of 12021644 is about 229.0804113661.

Adding to 12021644 its reverse (44612021), we get a palindrome (56633665).

The spelling of 12021644 in words is "twelve million, twenty-one thousand, six hundred forty-four".