212347871 has 2 divisors, whose sum is σ = 212347872. Its totient is φ = 212347870.

The previous prime is 212347843. The next prime is 212347873. The reversal of 212347871 is 178743212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212347871 is a prime.

Together with 212347873, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212347873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106173935 + 106173936.

It is an arithmetic number, because the mean of its divisors is an integer number (106173936).

Almost surely, 2^212347871 is an apocalyptic number.

212347871 is a deficient number, since it is larger than the sum of its proper divisors (1).

212347871 is an equidigital number, since it uses as much as digits as its factorization.

212347871 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18816, while the sum is 35.

The square root of 212347871 is about 14572.1608212372. The cubic root of 212347871 is about 596.5991592979.

It can be divided in two parts, 2123 and 47871, that added together give a palindrome (49994).

The spelling of 212347871 in words is "two hundred twelve million, three hundred forty-seven thousand, eight hundred seventy-one".