212165205 has 16 divisors (see below), whose sum is σ = 387959424. Its totient is φ = 96989760.

The previous prime is 212165197. The next prime is 212165207. The reversal of 212165205 is 502561212.

It is a happy number.

It is not a de Polignac number, because 212165205 - 2³ = 212165197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212165207) 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 15 ways as a sum of consecutive naturals, for example, 1010206 + ... + 1010415.

It is an arithmetic number, because the mean of its divisors is an integer number (24247464).

Almost surely, 2^212165205 is an apocalyptic number.

It is an amenable number.

212165205 is a deficient number, since it is larger than the sum of its proper divisors (175794219).

212165205 is a wasteful number, since it uses less digits than its factorization.

212165205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2020636.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 212165205 is about 14565.8918367534. The cubic root of 212165205 is about 596.4280412720.

The spelling of 212165205 in words is "two hundred twelve million, one hundred sixty-five thousand, two hundred five".