100212209 has 4 divisors (see below), whose sum is σ = 100499700. Its totient is φ = 99924720.

The previous prime is 100212163. The next prime is 100212223. The reversal of 100212209 is 902212001.

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 83631025 + 16581184 = 9145^2 + 4072^2 .

It is a cyclic number.

It is not a de Polignac number, because 100212209 - 2²⁴ = 83434993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100212709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 143222 + ... + 143919.

It is an arithmetic number, because the mean of its divisors is an integer number (25124925).

Almost surely, 2^100212209 is an apocalyptic number.

It is an amenable number.

100212209 is a deficient number, since it is larger than the sum of its proper divisors (287491).

100212209 is an equidigital number, since it uses as much as digits as its factorization.

100212209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287490.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 100212209 is about 10010.6048268823. The cubic root of 100212209 is about 464.4869803617.

The spelling of 100212209 in words is "one hundred million, two hundred twelve thousand, two hundred nine".