12021865 has 8 divisors (see below), whose sum is σ = 14522688. Its totient is φ = 9553200.

The previous prime is 12021857. The next prime is 12021869. The reversal of 12021865 is 56812021.

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

It is not a de Polignac number, because 12021865 - 2³ = 12021857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12021869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7207 + ... + 8716.

It is an arithmetic number, because the mean of its divisors is an integer number (1815336).

Almost surely, 2^12021865 is an apocalyptic number.

It is an amenable number.

12021865 is a deficient number, since it is larger than the sum of its proper divisors (2500823).

12021865 is a wasteful number, since it uses less digits than its factorization.

12021865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16079.

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 12021865 is about 3467.2561197581. The cubic root of 12021865 is about 229.0818151247.

Adding to 12021865 its reverse (56812021), we get a palindrome (68833886).

The spelling of 12021865 in words is "twelve million, twenty-one thousand, eight hundred sixty-five".