12018421 has 8 divisors (see below), whose sum is σ = 12455424. Its totient is φ = 11584560.

The previous prime is 12018401. The next prime is 12018437. The reversal of 12018421 is 12481021.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12018421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12018401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9216 + ... + 10438.

It is an arithmetic number, because the mean of its divisors is an integer number (1556928).

Almost surely, 2^12018421 is an apocalyptic number.

It is an amenable number.

12018421 is a deficient number, since it is larger than the sum of its proper divisors (437003).

12018421 is a wasteful number, since it uses less digits than its factorization.

12018421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1571.

The product of its (nonzero) digits is 128, while the sum is 19.

The square root of 12018421 is about 3466.7594378612. The cubic root of 12018421 is about 229.0599374010.

Adding to 12018421 its reverse (12481021), we get a palindrome (24499442).

The spelling of 12018421 in words is "twelve million, eighteen thousand, four hundred twenty-one".