211056865 has 16 divisors (see below), whose sum is σ = 262440000. Its totient is φ = 162839872.

The previous prime is 211056847. The next prime is 211056893. The reversal of 211056865 is 568650112.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 211056865 - 2⁷ = 211056737 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 211056865.

It is an unprimeable number.

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, 8886 + ... + 22384.

It is an arithmetic number, because the mean of its divisors is an integer number (16402500).

Almost surely, 2^211056865 is an apocalyptic number.

It is an amenable number.

211056865 is a deficient number, since it is larger than the sum of its proper divisors (51383135).

211056865 is a wasteful number, since it uses less digits than its factorization.

211056865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13616.

The product of its (nonzero) digits is 14400, while the sum is 34.

The square root of 211056865 is about 14527.7962884947. The cubic root of 211056865 is about 595.3876578344.

The spelling of 211056865 in words is "two hundred eleven million, fifty-six thousand, eight hundred sixty-five".