212211205 has 16 divisors (see below), whose sum is σ = 260235504. Its totient is φ = 166067200.

The previous prime is 212211193. The next prime is 212211269. The reversal of 212211205 is 502112212.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 1119364 + 211091841 = 1058^2 + 14529^2 .

It is a de Polignac number, because none of the positive numbers 2^k-212211205 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 (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 105267 + ... + 107263.

It is an arithmetic number, because the mean of its divisors is an integer number (16264719).

Almost surely, 2^212211205 is an apocalyptic number.

It is an amenable number.

212211205 is a deficient number, since it is larger than the sum of its proper divisors (48024299).

212211205 is a wasteful number, since it uses less digits than its factorization.

212211205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2456.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 212211205 is about 14567.4707825346. The cubic root of 212211205 is about 596.4711424446.

Adding to 212211205 its reverse (502112212), we get a palindrome (714323417).

The spelling of 212211205 in words is "two hundred twelve million, two hundred eleven thousand, two hundred five".