12421504 has 32 divisors (see below), whose sum is σ = 25226640. Its totient is φ = 6090240.

The previous prime is 12421501. The next prime is 12421517. The reversal of 12421504 is 40512421.

12421504 = T₁₀₅ + T₁₀₆ + ... + T₄₂₂.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12421501) 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, 5869 + ... + 7699.

Almost surely, 2^12421504 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 12421504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12613320).

12421504 is an abundant number, since it is smaller than the sum of its proper divisors (12805136).

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

12421504 is an equidigital number, since it uses as much as digits as its factorization.

12421504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1898 (or 1886 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 12421504 is about 3524.4154125188. The cubic root of 12421504 is about 231.5926263632.

Adding to 12421504 its reverse (40512421), we get a palindrome (52933925).

The spelling of 12421504 in words is "twelve million, four hundred twenty-one thousand, five hundred four".