12216887 has 4 divisors (see below), whose sum is σ = 12748080. Its totient is φ = 11685696.

The previous prime is 12216877. The next prime is 12216901. The reversal of 12216887 is 78861221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78861221 = 257 ⋅306853.

It is a cyclic number.

It is not a de Polignac number, because 12216887 - 2⁶ = 12216823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12216817) 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, 265562 + ... + 265607.

It is an arithmetic number, because the mean of its divisors is an integer number (3187020).

Almost surely, 2^12216887 is an apocalyptic number.

12216887 is a deficient number, since it is larger than the sum of its proper divisors (531193).

12216887 is an equidigital number, since it uses as much as digits as its factorization.

12216887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 531192.

The product of its digits is 10752, while the sum is 35.

The square root of 12216887 is about 3495.2663703930. The cubic root of 12216887 is about 230.3139191736.

The spelling of 12216887 in words is "twelve million, two hundred sixteen thousand, eight hundred eighty-seven".