12221504 has 56 divisors (see below), whose sum is σ = 26334720. Its totient is φ = 5605376.

The previous prime is 12221497. The next prime is 12221519. The reversal of 12221504 is 40512221.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51017 + ... + 51255.

Almost surely, 2^12221504 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 12221504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13167360).

12221504 is an abundant number, since it is smaller than the sum of its proper divisors (14113216).

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

12221504 is a wasteful number, since it uses less digits than its factorization.

12221504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315 (or 305 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 12221504 is about 3495.9267726885. The cubic root of 12221504 is about 230.3429288942.

Adding to 12221504 its reverse (40512221), we get a palindrome (52733725).

The spelling of 12221504 in words is "twelve million, two hundred twenty-one thousand, five hundred four".