103212209 has 4 divisors (see below), whose sum is σ = 104159220. Its totient is φ = 102265200.

The previous prime is 103212191. The next prime is 103212217. The reversal of 103212209 is 902212301.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 902212301 = 29 ⋅31110769.

It can be written as a sum of positive squares in 2 ways, for example, as 31047184 + 72165025 = 5572^2 + 8495^2 .

It is a cyclic number.

It is not a de Polignac number, because 103212209 - 2¹² = 103208113 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (103212229) by changing a digit.

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, 473342 + ... + 473559.

It is an arithmetic number, because the mean of its divisors is an integer number (26039805).

Almost surely, 2^103212209 is an apocalyptic number.

It is an amenable number.

103212209 is a deficient number, since it is larger than the sum of its proper divisors (947011).

103212209 is an equidigital number, since it uses as much as digits as its factorization.

103212209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 947010.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 103212209 is about 10159.3409727206. The cubic root of 103212209 is about 469.0765162338.

The spelling of 103212209 in words is "one hundred three million, two hundred twelve thousand, two hundred nine".