100821604 has 24 divisors (see below), whose sum is σ = 198273600. Its totient is φ = 44509344.

The previous prime is 100821587. The next prime is 100821613. The reversal of 100821604 is 406128001.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40954 + ... + 43345.

It is an arithmetic number, because the mean of its divisors is an integer number (8261400).

Almost surely, 2^100821604 is an apocalyptic number.

It is an amenable number.

100821604 is a deficient number, since it is larger than the sum of its proper divisors (97451996).

100821604 is a wasteful number, since it uses less digits than its factorization.

100821604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84339 (or 84337 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 100821604 is about 10040.9961657198. The cubic root of 100821604 is about 465.4266004535.

Adding to 100821604 its reverse (406128001), we get a palindrome (506949605).

The spelling of 100821604 in words is "one hundred million, eight hundred twenty-one thousand, six hundred four".