100821587 has 2 divisors, whose sum is σ = 100821588. Its totient is φ = 100821586.

The previous prime is 100821569. The next prime is 100821613. The reversal of 100821587 is 785128001.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 100821587 - 2¹⁰ = 100820563 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (100821547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50410793 + 50410794.

It is an arithmetic number, because the mean of its divisors is an integer number (50410794).

Almost surely, 2^100821587 is an apocalyptic number.

100821587 is a deficient number, since it is larger than the sum of its proper divisors (1).

100821587 is an equidigital number, since it uses as much as digits as its factorization.

100821587 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4480, while the sum is 32.

The square root of 100821587 is about 10040.9953191902. The cubic root of 100821587 is about 465.4265742943.

Adding to 100821587 its reverse (785128001), we get a palindrome (885949588).

The spelling of 100821587 in words is "one hundred million, eight hundred twenty-one thousand, five hundred eighty-seven".