211971671 has 2 divisors, whose sum is σ = 211971672. Its totient is φ = 211971670.

The previous prime is 211971653. The next prime is 211971673. The reversal of 211971671 is 176179112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 211971671 - 2⁶ = 211971607 is a prime.

Together with 211971673, 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 (211971673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105985835 + 105985836.

It is an arithmetic number, because the mean of its divisors is an integer number (105985836).

Almost surely, 2^211971671 is an apocalyptic number.

211971671 is a deficient number, since it is larger than the sum of its proper divisors (1).

211971671 is an equidigital number, since it uses as much as digits as its factorization.

211971671 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5292, while the sum is 35.

The square root of 211971671 is about 14559.2469242059. The cubic root of 211971671 is about 596.2466351206.

The spelling of 211971671 in words is "two hundred eleven million, nine hundred seventy-one thousand, six hundred seventy-one".