211907 has 6 divisors (see below), whose sum is σ = 224028. Its totient is φ = 200412.

The previous prime is 211891. The next prime is 211927. The reversal of 211907 is 709112.

It is not a de Polignac number, because 211907 - 2⁴ = 211891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211927) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 68 + ... + 654.

It is an arithmetic number, because the mean of its divisors is an integer number (37338).

2²¹¹⁹⁰⁷ is an apocalyptic number.

211907 is a deficient number, since it is larger than the sum of its proper divisors (12121).

211907 is an equidigital number, since it uses as much as digits as its factorization.

211907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 625 (or 606 counting only the distinct ones).

The product of its (nonzero) digits is 126, while the sum is 20.

The square root of 211907 is about 460.3335747043. Note that the first 3 decimals coincide. The cubic root of 211907 is about 59.6185992130.

The spelling of 211907 in words is "two hundred eleven thousand, nine hundred seven".