212201305 has 8 divisors (see below), whose sum is σ = 254753352. Its totient is φ = 169686528.

The previous prime is 212201239. The next prime is 212201333. The reversal of 212201305 is 503102212.

It can be written as a sum of positive squares in 4 ways, for example, as 53743561 + 158457744 = 7331^2 + 12588^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212201305 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5299 + ... + 21271.

It is an arithmetic number, because the mean of its divisors is an integer number (31844169).

Almost surely, 2^212201305 is an apocalyptic number.

It is an amenable number.

212201305 is a deficient number, since it is larger than the sum of its proper divisors (42552047).

212201305 is a wasteful number, since it uses less digits than its factorization.

212201305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18635.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 212201305 is about 14567.1309803956. The cubic root of 212201305 is about 596.4618668487.

Adding to 212201305 its reverse (503102212), we get a palindrome (715303517).

The spelling of 212201305 in words is "two hundred twelve million, two hundred one thousand, three hundred five".