12216101 has 2 divisors, whose sum is σ = 12216102. Its totient is φ = 12216100.

The previous prime is 12216089. The next prime is 12216103. The reversal of 12216101 is 10161221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10407076 + 1809025 = 3226^2 + 1345^2 .

It is a cyclic number.

It is not a de Polignac number, because 12216101 - 2⁶ = 12216037 is a prime.

Together with 12216103, it forms a pair of twin primes.

It is a Chen prime.

It is a plaindrome in base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12216103) 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 as a sum of consecutive naturals, namely, 6108050 + 6108051.

It is an arithmetic number, because the mean of its divisors is an integer number (6108051).

Almost surely, 2^12216101 is an apocalyptic number.

It is an amenable number.

12216101 is a deficient number, since it is larger than the sum of its proper divisors (1).

12216101 is an equidigital number, since it uses as much as digits as its factorization.

12216101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 14.

The square root of 12216101 is about 3495.1539308019. The cubic root of 12216101 is about 230.3089798186.

Adding to 12216101 its reverse (10161221), we get a palindrome (22377322).

The spelling of 12216101 in words is "twelve million, two hundred sixteen thousand, one hundred one".