12021864 has 16 divisors (see below), whose sum is σ = 30054720. Its totient is φ = 4007280.

The previous prime is 12021857. The next prime is 12021869. The reversal of 12021864 is 46812021.

12021864 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 500911 = 12021864 / (1 + 2 + 0 + 2 + 1 + 8 + 6 + 4).

It is not an unprimeable number, because it can be changed into a prime (12021869) 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, 250432 + ... + 250479.

It is an arithmetic number, because the mean of its divisors is an integer number (1878420).

Almost surely, 2^12021864 is an apocalyptic number.

It is an amenable number.

12021864 is an abundant number, since it is smaller than the sum of its proper divisors (18032856).

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

12021864 is a wasteful number, since it uses less digits than its factorization.

12021864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500920 (or 500916 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 12021864 is about 3467.2559755518. The cubic root of 12021864 is about 229.0818087729.

Adding to 12021864 its reverse (46812021), we get a palindrome (58833885).

The spelling of 12021864 in words is "twelve million, twenty-one thousand, eight hundred sixty-four".