12004421 has 16 divisors (see below), whose sum is σ = 14235648. Its totient is φ = 9979200.

The previous prime is 12004417. The next prime is 12004427. The reversal of 12004421 is 12440021.

12004421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12004421 - 2² = 12004417 is a prime.

It is a super-2 number, since 2×12004421² = 288212247090482, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12004396 and 12004405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12004427) 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, 17831 + ... + 18491.

It is an arithmetic number, because the mean of its divisors is an integer number (889728).

Almost surely, 2^12004421 is an apocalyptic number.

12004421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12004421 is a deficient number, since it is larger than the sum of its proper divisors (2231227).

12004421 is a wasteful number, since it uses less digits than its factorization.

12004421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 812.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 12004421 is about 3464.7396727604. The cubic root of 12004421 is about 228.9709605123.

Adding to 12004421 its reverse (12440021), we get a palindrome (24444442).

Subtracting 12004421 from its reverse (12440021), we obtain a square (435600 = 660²).

The spelling of 12004421 in words is "twelve million, four thousand, four hundred twenty-one".