212643671 has 16 divisors (see below), whose sum is σ = 230489280. Its totient is φ = 195655680.

The previous prime is 212643661. The next prime is 212643677. The reversal of 212643671 is 176346212.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212643671 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212643677) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 67295 + ... + 70383.

It is an arithmetic number, because the mean of its divisors is an integer number (14405580).

Almost surely, 2^212643671 is an apocalyptic number.

212643671 is a deficient number, since it is larger than the sum of its proper divisors (17845609).

212643671 is a wasteful number, since it uses less digits than its factorization.

212643671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3226.

The product of its digits is 12096, while the sum is 32.

The square root of 212643671 is about 14582.3067791073. The cubic root of 212643671 is about 596.8760510969.

Adding to 212643671 its reverse (176346212), we get a palindrome (388989883).

The spelling of 212643671 in words is "two hundred twelve million, six hundred forty-three thousand, six hundred seventy-one".