100215305 has 4 divisors (see below), whose sum is σ = 120258372. Its totient is φ = 80172240.

The previous prime is 100215263. The next prime is 100215341. The reversal of 100215305 is 503512001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 503512001 = 17 ⋅29618353.

It can be written as a sum of positive squares in 2 ways, for example, as 52591504 + 47623801 = 7252^2 + 6901^2 .

It is not a de Polignac number, because 100215305 - 2¹⁰ = 100214281 is a prime.

It is a Duffinian 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 3 ways as a sum of consecutive naturals, for example, 10021526 + ... + 10021535.

It is an arithmetic number, because the mean of its divisors is an integer number (30064593).

Almost surely, 2^100215305 is an apocalyptic number.

It is an amenable number.

100215305 is a deficient number, since it is larger than the sum of its proper divisors (20043067).

100215305 is an equidigital number, since it uses as much as digits as its factorization.

100215305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20043066.

The product of its (nonzero) digits is 150, while the sum is 17.

The square root of 100215305 is about 10010.7594616992. The cubic root of 100215305 is about 464.4917636674.

Adding to 100215305 its reverse (503512001), we get a palindrome (603727306).

The spelling of 100215305 in words is "one hundred million, two hundred fifteen thousand, three hundred five".