12121100171 has 2 divisors, whose sum is σ = 12121100172. Its totient is φ = 12121100170.

The previous prime is 12121100143. The next prime is 12121100209. The reversal of 12121100171 is 17100112121.

It is a weak prime.

It is an emirp because it is prime and its reverse (17100112121) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12121100171 is a prime.

It is not a weakly prime, because it can be changed into another prime (12121100111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6060550085 + 6060550086.

It is an arithmetic number, because the mean of its divisors is an integer number (6060550086).

Almost surely, 2^12121100171 is an apocalyptic number.

12121100171 is a deficient number, since it is larger than the sum of its proper divisors (1).

12121100171 is an equidigital number, since it uses as much as digits as its factorization.

12121100171 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28, while the sum is 17.

Adding to 12121100171 its reverse (17100112121), we get a palindrome (29221212292).

The spelling of 12121100171 in words is "twelve billion, one hundred twenty-one million, one hundred thousand, one hundred seventy-one".