100221124987 has 4 divisors (see below), whose sum is σ = 100781019720. Its totient is φ = 99661230256.

The previous prime is 100221124957. The next prime is 100221125021. The reversal of 100221124987 is 789421122001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 789421122001 = 53569 ⋅14736529.

It is a cyclic number.

It is not a de Polignac number, because 100221124987 - 2⁷ = 100221124859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100221124907) 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 3 ways as a sum of consecutive naturals, for example, 279947098 + ... + 279947455.

It is an arithmetic number, because the mean of its divisors is an integer number (25195254930).

Almost surely, 2^100221124987 is an apocalyptic number.

100221124987 is a deficient number, since it is larger than the sum of its proper divisors (559894733).

100221124987 is an equidigital number, since it uses as much as digits as its factorization.

100221124987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 559894732.

The product of its (nonzero) digits is 16128, while the sum is 37.

Adding to 100221124987 its reverse (789421122001), we get a palindrome (889642246988).

The spelling of 100221124987 in words is "one hundred billion, two hundred twenty-one million, one hundred twenty-four thousand, nine hundred eighty-seven".