100111021121987 has 8 divisors (see below), whose sum is σ = 106099062739200. Its totient is φ = 94133997062784.

The previous prime is 100111021121981. The next prime is 100111021122043. The reversal of 100111021121987 is 789121120111001.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 100111021121987 - 2²⁰ = 100111020073411 is a prime.

It is not an unprimeable number, because it can be changed into a prime (100111021121981) 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 in 7 ways as a sum of consecutive naturals, for example, 2754370787 + ... + 2754407132.

It is an arithmetic number, because the mean of its divisors is an integer number (13262382842400).

Almost surely, 2^{100111021121987} is an apocalyptic number.

100111021121987 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

100111021121987 is a deficient number, since it is larger than the sum of its proper divisors (5988041617213).

100111021121987 is a wasteful number, since it uses less digits than its factorization.

100111021121987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5508779005.

The product of its (nonzero) digits is 2016, while the sum is 35.

Adding to 100111021121987 its reverse (789121120111001), we get a palindrome (889232141232988).

The spelling of 100111021121987 in words is "one hundred trillion, one hundred eleven billion, twenty-one million, one hundred twenty-one thousand, nine hundred eighty-seven".