12021804 has 48 divisors (see below), whose sum is σ = 31410400. Its totient is φ = 3976128.

The previous prime is 12021797. The next prime is 12021809. The reversal of 12021804 is 40812021.

12021804 is digitally balanced in base 2, because in such base 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 (18).

It is not an unprimeable number, because it can be changed into a prime (12021809) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16602 + ... + 17310.

Almost surely, 2^12021804 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12021804, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15705200).

12021804 is an abundant number, since it is smaller than the sum of its proper divisors (19388596).

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

12021804 is a wasteful number, since it uses less digits than its factorization.

12021804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 879 (or 871 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 12021804 is about 3467.2473231657. The cubic root of 12021804 is about 229.0814276637.

Adding to 12021804 its reverse (40812021), we get a palindrome (52833825).

The spelling of 12021804 in words is "twelve million, twenty-one thousand, eight hundred four".