12108211117 has 2 divisors, whose sum is σ = 12108211118. Its totient is φ = 12108211116.

The previous prime is 12108211097. The next prime is 12108211133. The reversal of 12108211117 is 71111280121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12067901316 + 40309801 = 109854^2 + 6349^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12108211117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12108211091 and 12108211100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12108211147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6054105558 + 6054105559.

It is an arithmetic number, because the mean of its divisors is an integer number (6054105559).

Almost surely, 2^12108211117 is an apocalyptic number.

It is an amenable number.

12108211117 is a deficient number, since it is larger than the sum of its proper divisors (1).

12108211117 is an equidigital number, since it uses as much as digits as its factorization.

12108211117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 224, while the sum is 25.

Adding to 12108211117 its reverse (71111280121), we get a palindrome (83219491238).

The spelling of 12108211117 in words is "twelve billion, one hundred eight million, two hundred eleven thousand, one hundred seventeen".