111001211101987 has 2 divisors, whose sum is σ = 111001211101988. Its totient is φ = 111001211101986.

The previous prime is 111001211101981. The next prime is 111001211102039. The reversal of 111001211101987 is 789101112100111.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 111001211101987 - 2¹⁵ = 111001211069219 is a prime.

It is a super-2 number, since 2×111001211101987² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (111001211101981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55500605550993 + 55500605550994.

It is an arithmetic number, because the mean of its divisors is an integer number (55500605550994).

Almost surely, 2^{111001211101987} is an apocalyptic number.

111001211101987 is a deficient number, since it is larger than the sum of its proper divisors (1).

111001211101987 is an equidigital number, since it uses as much as digits as its factorization.

111001211101987 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 34.

The spelling of 111001211101987 in words is "one hundred eleven trillion, one billion, two hundred eleven million, one hundred one thousand, nine hundred eighty-seven".