11110111211987 has 2 divisors, whose sum is σ = 11110111211988. Its totient is φ = 11110111211986.

The previous prime is 11110111211971. The next prime is 11110111212023. The reversal of 11110111211987 is 78911211101111.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11110111211987 - 2⁴ = 11110111211971 is a prime.

It is a super-2 number, since 2×11110111211987² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11110111211917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5555055605993 + 5555055605994.

It is an arithmetic number, because the mean of its divisors is an integer number (5555055605994).

Almost surely, 2^{11110111211987} is an apocalyptic number.

11110111211987 is a deficient number, since it is larger than the sum of its proper divisors (1).

11110111211987 is an equidigital number, since it uses as much as digits as its factorization.

11110111211987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 35.

The spelling of 11110111211987 in words is "eleven trillion, one hundred ten billion, one hundred eleven million, two hundred eleven thousand, nine hundred eighty-seven".