12111101983817 has 2 divisors, whose sum is σ = 12111101983818. Its totient is φ = 12111101983816.

The previous prime is 12111101983723. The next prime is 12111101983873. The reversal of 12111101983817 is 71838910111121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6319647959881 + 5791454023936 = 2513891^2 + 2406544^2 .

It is an emirp because it is prime and its reverse (71838910111121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12111101983817 - 2⁴² = 7713055472713 is a prime.

It is not a weakly prime, because it can be changed into another prime (12111101983217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6055550991908 + 6055550991909.

It is an arithmetic number, because the mean of its divisors is an integer number (6055550991909).

Almost surely, 2^{12111101983817} is an apocalyptic number.

It is an amenable number.

12111101983817 is a deficient number, since it is larger than the sum of its proper divisors (1).

12111101983817 is an equidigital number, since it uses as much as digits as its factorization.

12111101983817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 44.

The spelling of 12111101983817 in words is "twelve trillion, one hundred eleven billion, one hundred one million, nine hundred eighty-three thousand, eight hundred seventeen".