203212105 has 4 divisors (see below), whose sum is σ = 243854532. Its totient is φ = 162569680.

The previous prime is 203212073. The next prime is 203212111. The reversal of 203212105 is 501212302.

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 77951241 + 125260864 = 8829^2 + 11192^2 .

It is not a de Polignac number, because 203212105 - 2⁵ = 203212073 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20321206 + ... + 20321215.

It is an arithmetic number, because the mean of its divisors is an integer number (60963633).

Almost surely, 2^203212105 is an apocalyptic number.

It is an amenable number.

203212105 is a deficient number, since it is larger than the sum of its proper divisors (40642427).

203212105 is an equidigital number, since it uses as much as digits as its factorization.

203212105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40642426.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 203212105 is about 14255.2483317549. The cubic root of 203212105 is about 587.9176857717.

Adding to 203212105 its reverse (501212302), we get a palindrome (704424407).

The spelling of 203212105 in words is "two hundred three million, two hundred twelve thousand, one hundred five".