111211011987 has 16 divisors (see below), whose sum is σ = 151912148640. Its totient is φ = 72325612800.

The previous prime is 111211011979. The next prime is 111211012001. The reversal of 111211011987 is 789110112111.

It is not a de Polignac number, because 111211011987 - 2³ = 111211011979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (111211010987) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1512537 + ... + 1584357.

It is an arithmetic number, because the mean of its divisors is an integer number (9494509290).

Almost surely, 2^111211011987 is an apocalyptic number.

111211011987 is a deficient number, since it is larger than the sum of its proper divisors (40701136653).

111211011987 is a wasteful number, since it uses less digits than its factorization.

111211011987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84454.

The product of its (nonzero) digits is 1008, while the sum is 33.

The spelling of 111211011987 in words is "one hundred eleven billion, two hundred eleven million, eleven thousand, nine hundred eighty-seven".