12216657 has 16 divisors (see below), whose sum is σ = 17175168. Its totient is φ = 7708800.

The previous prime is 12216643. The next prime is 12216661. The reversal of 12216657 is 75661221.

12216657 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12216657 - 2⁶ = 12216593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12216857) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6093 + ... + 7845.

It is an arithmetic number, because the mean of its divisors is an integer number (1073448).

Almost surely, 2^12216657 is an apocalyptic number.

It is an amenable number.

12216657 is a deficient number, since it is larger than the sum of its proper divisors (4958511).

12216657 is a wasteful number, since it uses less digits than its factorization.

12216657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1880.

The product of its digits is 5040, while the sum is 30.

The square root of 12216657 is about 3495.2334685969. The cubic root of 12216657 is about 230.3124738372.

Adding to 12216657 its reverse (75661221), we get a palindrome (87877878).

The spelling of 12216657 in words is "twelve million, two hundred sixteen thousand, six hundred fifty-seven".