12216550 has 24 divisors (see below), whose sum is σ = 23040936. Its totient is φ = 4818240.

The previous prime is 12216541. The next prime is 12216559. The reversal of 12216550 is 5561221.

It is an interprime number because it is at equal distance from previous prime (12216541) and next prime (12216559).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12216559) 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 11 ways as a sum of consecutive naturals, for example, 1977 + ... + 5323.

It is an arithmetic number, because the mean of its divisors is an integer number (960039).

Almost surely, 2^12216550 is an apocalyptic number.

12216550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12216550 is a deficient number, since it is larger than the sum of its proper divisors (10824386).

12216550 is a wasteful number, since it uses less digits than its factorization.

12216550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3432 (or 3427 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 12216550 is about 3495.2181620036. The cubic root of 12216550 is about 230.3118014354.

Adding to 12216550 its reverse (5561221), we get a palindrome (17777771).

The spelling of 12216550 in words is "twelve million, two hundred sixteen thousand, five hundred fifty".