100821245 has 8 divisors (see below), whose sum is σ = 138269184. Its totient is φ = 69134544.

The previous prime is 100821233. The next prime is 100821289. The reversal of 100821245 is 542128001.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 100821245 - 2⁴ = 100821229 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 100821245.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1440269 + ... + 1440338.

It is an arithmetic number, because the mean of its divisors is an integer number (17283648).

Almost surely, 2^100821245 is an apocalyptic number.

It is an amenable number.

100821245 is a deficient number, since it is larger than the sum of its proper divisors (37447939).

100821245 is an equidigital number, since it uses as much as digits as its factorization.

100821245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2880619.

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 100821245 is about 10040.9782889916. The cubic root of 100821245 is about 465.4260480311.

Adding to 100821245 its reverse (542128001), we get a palindrome (642949246).

The spelling of 100821245 in words is "one hundred million, eight hundred twenty-one thousand, two hundred forty-five".