1111212120197 has 2 divisors, whose sum is σ = 1111212120198. Its totient is φ = 1111212120196.

The previous prime is 1111212120191. The next prime is 1111212120209. The reversal of 1111212120197 is 7910212121111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 929297928001 + 181914192196 = 964001^2 + 426514^2 .

It is an emirp because it is prime and its reverse (7910212121111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1111212120197 - 2⁴ = 1111212120181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1111212120191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 555606060098 + 555606060099.

It is an arithmetic number, because the mean of its divisors is an integer number (555606060099).

Almost surely, 2^{1111212120197} is an apocalyptic number.

It is an amenable number.

1111212120197 is a deficient number, since it is larger than the sum of its proper divisors (1).

1111212120197 is an equidigital number, since it uses as much as digits as its factorization.

1111212120197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504, while the sum is 29.

The spelling of 1111212120197 in words is "one trillion, one hundred eleven billion, two hundred twelve million, one hundred twenty thousand, one hundred ninety-seven".