211420171 has 2 divisors, whose sum is σ = 211420172. Its totient is φ = 211420170.

The previous prime is 211420151. The next prime is 211420199. The reversal of 211420171 is 171024112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 211420171 - 2⁷ = 211420043 is a prime.

It is not a weakly prime, because it can be changed into another prime (211420151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105710085 + 105710086.

It is an arithmetic number, because the mean of its divisors is an integer number (105710086).

Almost surely, 2^211420171 is an apocalyptic number.

211420171 is a deficient number, since it is larger than the sum of its proper divisors (1).

211420171 is an equidigital number, since it uses as much as digits as its factorization.

211420171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112, while the sum is 19.

The square root of 211420171 is about 14540.2947356647. The cubic root of 211420171 is about 595.7290885857.

Adding to 211420171 its reverse (171024112), we get a palindrome (382444283).

The spelling of 211420171 in words is "two hundred eleven million, four hundred twenty thousand, one hundred seventy-one".