12216560 has 40 divisors (see below), whose sum is σ = 28777920. Its totient is φ = 4822272.

The previous prime is 12216559. The next prime is 12216577. The reversal of 12216560 is 6561221.

12216560 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

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, 5354 + ... + 7286.

It is an arithmetic number, because the mean of its divisors is an integer number (719448).

Almost surely, 2^12216560 is an apocalyptic number.

12216560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12216560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14388960).

12216560 is an abundant number, since it is smaller than the sum of its proper divisors (16561360).

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

12216560 is a wasteful number, since it uses less digits than its factorization.

12216560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2025 (or 2019 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 12216560 is about 3495.2195925292. The cubic root of 12216560 is about 230.3118642768.

Adding to 12216560 its reverse (6561221), we get a palindrome (18777781).

The spelling of 12216560 in words is "twelve million, two hundred sixteen thousand, five hundred sixty".