100002099987 has 20 divisors (see below), whose sum is σ = 149410800000. Its totient is φ = 66656933424.

The previous prime is 100002099971. The next prime is 100002100043. The reversal of 100002099987 is 789990200001.

It is not a de Polignac number, because 100002099987 - 2⁴ = 100002099971 is a prime.

It is not an unprimeable number, because it can be changed into a prime (100002099287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 400014 + ... + 600012.

It is an arithmetic number, because the mean of its divisors is an integer number (7470540000).

Almost surely, 2^100002099987 is an apocalyptic number.

100002099987 is a deficient number, since it is larger than the sum of its proper divisors (49408700013).

100002099987 is an equidigital number, since it uses as much as digits as its factorization.

100002099987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206184 (or 206175 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 45.

Adding to 100002099987 its reverse (789990200001), we get a palindrome (889992299988).

The spelling of 100002099987 in words is "one hundred billion, two million, ninety-nine thousand, nine hundred eighty-seven".