12216653 has 4 divisors (see below), whose sum is σ = 12416988. Its totient is φ = 12016320.

The previous prime is 12216643. The next prime is 12216661. The reversal of 12216653 is 35661221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 35661221 = 761 ⋅46861.

It can be written as a sum of positive squares in 2 ways, for example, as 1471369 + 10745284 = 1213^2 + 3278^2 .

It is a cyclic number.

It is not a de Polignac number, because 12216653 - 2⁸ = 12216397 is a prime.

It is a super-2 number, since 2×12216653² = 298493221044818, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12216643) 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 3 ways as a sum of consecutive naturals, for example, 100076 + ... + 100197.

It is an arithmetic number, because the mean of its divisors is an integer number (3104247).

Almost surely, 2^12216653 is an apocalyptic number.

It is an amenable number.

12216653 is a deficient number, since it is larger than the sum of its proper divisors (200335).

12216653 is an equidigital number, since it uses as much as digits as its factorization.

12216653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200334.

The product of its digits is 2160, while the sum is 26.

The square root of 12216653 is about 3495.2328963890. The cubic root of 12216653 is about 230.3124487007.

Adding to 12216653 its reverse (35661221), we get a palindrome (47877874).

The spelling of 12216653 in words is "twelve million, two hundred sixteen thousand, six hundred fifty-three".