100216705 has 4 divisors (see below), whose sum is σ = 120260052. Its totient is φ = 80173360.

The previous prime is 100216667. The next prime is 100216709. The reversal of 100216705 is 507612001.

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

It can be written as a sum of positive squares in 2 ways, for example, as 58018689 + 42198016 = 7617^2 + 6496^2 .

It is not a de Polignac number, because 100216705 - 2⁷ = 100216577 is a prime.

It is a super-2 number, since 2×100216705² = 20086775922114050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100216709) 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, 10021666 + ... + 10021675.

It is an arithmetic number, because the mean of its divisors is an integer number (30065013).

Almost surely, 2^100216705 is an apocalyptic number.

It is an amenable number.

100216705 is a deficient number, since it is larger than the sum of its proper divisors (20043347).

100216705 is an equidigital number, since it uses as much as digits as its factorization.

100216705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20043346.

The product of its (nonzero) digits is 420, while the sum is 22.

The square root of 100216705 is about 10010.8293862197. The cubic root of 100216705 is about 464.4939266286.

Adding to 100216705 its reverse (507612001), we get a palindrome (607828706).

The spelling of 100216705 in words is "one hundred million, two hundred sixteen thousand, seven hundred five".