12213504 has 180 divisors, whose sum is σ = 39571840. Its totient is φ = 3732480.

The previous prime is 12213499. The next prime is 12213511. The reversal of 12213504 is 40531221.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nialpdrome in base 12.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 393969 + ... + 393999.

Almost surely, 2^12213504 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 12213504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19785920).

12213504 is an abundant number, since it is smaller than the sum of its proper divisors (27358336).

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

12213504 is an equidigital number, since it uses as much as digits as its factorization.

12213504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78 (or 55 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 12213504 is about 3494.7823966593. The cubic root of 12213504 is about 230.2926583314.

Adding to 12213504 its reverse (40531221), we get a palindrome (52744725).

The spelling of 12213504 in words is "twelve million, two hundred thirteen thousand, five hundred four".