11112011121997 has 2 divisors, whose sum is σ = 11112011121998. Its totient is φ = 11112011121996.

The previous prime is 11112011121973. The next prime is 11112011122057. The reversal of 11112011121997 is 79912111021111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6837252254596 + 4274758867401 = 2614814^2 + 2067549^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11112011121997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11112011121907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5556005560998 + 5556005560999.

It is an arithmetic number, because the mean of its divisors is an integer number (5556005560999).

Almost surely, 2^{11112011121997} is an apocalyptic number.

It is an amenable number.

11112011121997 is a deficient number, since it is larger than the sum of its proper divisors (1).

11112011121997 is an equidigital number, since it uses as much as digits as its factorization.

11112011121997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2268, while the sum is 37.

The spelling of 11112011121997 in words is "eleven trillion, one hundred twelve billion, eleven million, one hundred twenty-one thousand, nine hundred ninety-seven".