12021646 has 24 divisors (see below), whose sum is σ = 22320144. Its totient is φ = 4754880.

The previous prime is 12021641. The next prime is 12021671. The reversal of 12021646 is 64612021.

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 175 + ... + 4906.

It is an arithmetic number, because the mean of its divisors is an integer number (930006).

Almost surely, 2^12021646 is an apocalyptic number.

12021646 is a deficient number, since it is larger than the sum of its proper divisors (10298498).

12021646 is a wasteful number, since it uses less digits than its factorization.

12021646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5116 (or 5103 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 12021646 is about 3467.2245384457. The cubic root of 12021646 is about 229.0804240699.

Adding to 12021646 its reverse (64612021), we get a palindrome (76633667).

The spelling of 12021646 in words is "twelve million, twenty-one thousand, six hundred forty-six".