100221587 has 4 divisors (see below), whose sum is σ = 101429160. Its totient is φ = 99014016.

The previous prime is 100221559. The next prime is 100221607. The reversal of 100221587 is 785122001.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 100221587 - 2¹⁰ = 100220563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100221487) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 603662 + ... + 603827.

It is an arithmetic number, because the mean of its divisors is an integer number (25357290).

Almost surely, 2^100221587 is an apocalyptic number.

100221587 is a deficient number, since it is larger than the sum of its proper divisors (1207573).

100221587 is an equidigital number, since it uses as much as digits as its factorization.

100221587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1207572.

The product of its (nonzero) digits is 1120, while the sum is 26.

The square root of 100221587 is about 10011.0732191908. The cubic root of 100221587 is about 464.5014690256.

Adding to 100221587 its reverse (785122001), we get a palindrome (885343588).

The spelling of 100221587 in words is "one hundred million, two hundred twenty-one thousand, five hundred eighty-seven".