12421216 has 12 divisors (see below), whose sum is σ = 24454332. Its totient is φ = 6210592.

The previous prime is 12421187. The next prime is 12421217. The reversal of 12421216 is 61212421.

It is a junction number, because it is equal to n+sod(n) for n = 12421193 and 12421202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12421217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194050 + ... + 194113.

It is an arithmetic number, because the mean of its divisors is an integer number (2037861).

Almost surely, 2^12421216 is an apocalyptic number.

12421216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

12421216 is a deficient number, since it is larger than the sum of its proper divisors (12033116).

12421216 is an equidigital number, since it uses as much as digits as its factorization.

12421216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388173 (or 388165 counting only the distinct ones).

The product of its digits is 192, while the sum is 19.

The square root of 12421216 is about 3524.3745544422. The cubic root of 12421216 is about 231.5908364782.

Adding to 12421216 its reverse (61212421), we get a palindrome (73633637).

The spelling of 12421216 in words is "twelve million, four hundred twenty-one thousand, two hundred sixteen".