212105005 has 16 divisors (see below), whose sum is σ = 307998720. Its totient is φ = 136887552.

The previous prime is 212104987. The next prime is 212105009. The reversal of 212105005 is 500501212.

It is a cyclic number.

It is not a de Polignac number, because 212105005 - 2¹⁷ = 211973933 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 212105005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212105009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 177645 + ... + 178834.

It is an arithmetic number, because the mean of its divisors is an integer number (19249920).

Almost surely, 2^212105005 is an apocalyptic number.

It is an amenable number.

212105005 is a deficient number, since it is larger than the sum of its proper divisors (95893715).

212105005 is a wasteful number, since it uses less digits than its factorization.

212105005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356508.

The product of its (nonzero) digits is 100, while the sum is 16.

The square root of 212105005 is about 14563.8252186711. The cubic root of 212105005 is about 596.3716255424.

Adding to 212105005 its reverse (500501212), we get a palindrome (712606217).

The spelling of 212105005 in words is "two hundred twelve million, one hundred five thousand, five".