12216651 has 8 divisors (see below), whose sum is σ = 16310784. Its totient is φ = 8133480.

The previous prime is 12216643. The next prime is 12216661. The reversal of 12216651 is 15661221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12216651 - 2³ = 12216643 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12216661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 366 + ... + 4956.

It is an arithmetic number, because the mean of its divisors is an integer number (2038848).

Almost surely, 2^12216651 is an apocalyptic number.

12216651 is a deficient number, since it is larger than the sum of its proper divisors (4094133).

12216651 is an equidigital number, since it uses as much as digits as its factorization.

12216651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5481.

The product of its digits is 720, while the sum is 24.

The square root of 12216651 is about 3495.2326102850. The cubic root of 12216651 is about 230.3124361325.

Adding to 12216651 its reverse (15661221), we get a palindrome (27877872).

The spelling of 12216651 in words is "twelve million, two hundred sixteen thousand, six hundred fifty-one".