102120111987 has 32 divisors (see below), whose sum is σ = 150479327232. Its totient is φ = 61272566784.

The previous prime is 102120111983. The next prime is 102120112007. The reversal of 102120111987 is 789111021201.

It is not a de Polignac number, because 102120111987 - 2² = 102120111983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (102120111983) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5206543 + ... + 5226119.

It is an arithmetic number, because the mean of its divisors is an integer number (4702478976).

Almost surely, 2^102120111987 is an apocalyptic number.

102120111987 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

102120111987 is a deficient number, since it is larger than the sum of its proper divisors (48359215245).

102120111987 is a wasteful number, since it uses less digits than its factorization.

102120111987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24067.

The product of its (nonzero) digits is 2016, while the sum is 33.

The spelling of 102120111987 in words is "one hundred two billion, one hundred twenty million, one hundred eleven thousand, nine hundred eighty-seven".