211204505205 has 48 divisors (see below), whose sum is σ = 378927704064. Its totient is φ = 108711486720.

The previous prime is 211204505203. The next prime is 211204505221. The reversal of 211204505205 is 502505402112.

211204505205 is a `hidden beast` number, since 2 + 1 + 1 + 2 + 0 + 450 + 5 + 205 = 666.

It is not a de Polignac number, because 211204505205 - 2¹ = 211204505203 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211204505203) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 305697 + ... + 718233.

It is an arithmetic number, because the mean of its divisors is an integer number (7894327168).

Almost surely, 2^211204505205 is an apocalyptic number.

It is an amenable number.

211204505205 is a deficient number, since it is larger than the sum of its proper divisors (167723198859).

211204505205 is a wasteful number, since it uses less digits than its factorization.

211204505205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412946 (or 412943 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 27.

Adding to 211204505205 its reverse (502505402112), we get a palindrome (713709907317).

The spelling of 211204505205 in words is "two hundred eleven billion, two hundred four million, five hundred five thousand, two hundred five".