12720216 has 32 divisors (see below), whose sum is σ = 33672240. Its totient is φ = 3990528.

The previous prime is 12720187. The next prime is 12720229. The reversal of 12720216 is 61202721.

It is a junction number, because it is equal to n+sod(n) for n = 12720192 and 12720201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15181 + ... + 15996.

Almost surely, 2^12720216 is an apocalyptic number.

It is an amenable number.

12720216 is an abundant number, since it is smaller than the sum of its proper divisors (20952024).

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

12720216 is a wasteful number, since it uses less digits than its factorization.

12720216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31203 (or 31199 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 12720216 is about 3566.5411815932. The cubic root of 12720216 is about 233.4343852551.

Adding to 12720216 its reverse (61202721), we get a palindrome (73922937).

The spelling of 12720216 in words is "twelve million, seven hundred twenty thousand, two hundred sixteen".