212115205 has 8 divisors (see below), whose sum is σ = 269511192. Its totient is φ = 159710208.

The previous prime is 212115139. The next prime is 212115227. The reversal of 212115205 is 502511212.

It can be written as a sum of positive squares in 4 ways, for example, as 24068836 + 188046369 = 4906^2 + 13713^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 212115205 - 2¹¹ = 212113157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1247652 + ... + 1247821.

It is an arithmetic number, because the mean of its divisors is an integer number (33688899).

Almost surely, 2^212115205 is an apocalyptic number.

It is an amenable number.

212115205 is a deficient number, since it is larger than the sum of its proper divisors (57395987).

212115205 is a wasteful number, since it uses less digits than its factorization.

212115205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2495495.

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 212115205 is about 14564.1753971861. The cubic root of 212115205 is about 596.3811851047.

Adding to 212115205 its reverse (502511212), we get a palindrome (714626417).

The spelling of 212115205 in words is "two hundred twelve million, one hundred fifteen thousand, two hundred five".