12216416 has 24 divisors (see below), whose sum is σ = 24131520. Its totient is φ = 6087808.

The previous prime is 12216403. The next prime is 12216419. The reversal of 12216416 is 61461221.

It is a junction number, because it is equal to n+sod(n) for n = 12216391 and 12216400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12216419) 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, 14930 + ... + 15726.

It is an arithmetic number, because the mean of its divisors is an integer number (1005480).

Almost surely, 2^12216416 is an apocalyptic number.

12216416 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

12216416 is a deficient number, since it is larger than the sum of its proper divisors (11915104).

12216416 is an equidigital number, since it uses as much as digits as its factorization.

12216416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1286 (or 1278 counting only the distinct ones).

The product of its digits is 576, while the sum is 23.

The square root of 12216416 is about 3495.1989929044. The cubic root of 12216416 is about 230.3109593565.

Adding to 12216416 its reverse (61461221), we get a palindrome (73677637).

The spelling of 12216416 in words is "twelve million, two hundred sixteen thousand, four hundred sixteen".