212206105 has 8 divisors (see below), whose sum is σ = 256984200. Its totient is φ = 168206976.

The previous prime is 212206103. The next prime is 212206123. The reversal of 212206105 is 501602212.

It can be written as a sum of positive squares in 4 ways, for example, as 50509449 + 161696656 = 7107^2 + 12716^2 .

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 212206105 - 2¹ = 212206103 is a prime.

It is not an unprimeable number, because it can be changed into a prime (212206103) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 194140 + ... + 195229.

It is an arithmetic number, because the mean of its divisors is an integer number (32123025).

Almost surely, 2^212206105 is an apocalyptic number.

It is an amenable number.

212206105 is a deficient number, since it is larger than the sum of its proper divisors (44778095).

212206105 is a wasteful number, since it uses less digits than its factorization.

212206105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389483.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 212206105 is about 14567.2957339377. The cubic root of 212206105 is about 596.4663641433.

Adding to 212206105 its reverse (501602212), we get a palindrome (713808317).

The spelling of 212206105 in words is "two hundred twelve million, two hundred six thousand, one hundred five".