211947 has 16 divisors (see below), whose sum is σ = 304128. Its totient is φ = 131040.

The previous prime is 211943. The next prime is 211949. The reversal of 211947 is 749112.

It is not a de Polignac number, because 211947 - 2² = 211943 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 211947.

It is not an unprimeable number, because it can be changed into a prime (211943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3973 + ... + 4025.

It is an arithmetic number, because the mean of its divisors is an integer number (19008).

2²¹¹⁹⁴⁷ is an apocalyptic number.

211947 is a deficient number, since it is larger than the sum of its proper divisors (92181).

211947 is a wasteful number, since it uses less digits than its factorization.

211947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130.

The product of its digits is 504, while the sum is 24.

The square root of 211947 is about 460.3770194091. The cubic root of 211947 is about 59.6223502200.

The spelling of 211947 in words is "two hundred eleven thousand, nine hundred forty-seven".