211042285 has 4 divisors (see below), whose sum is σ = 253250748. Its totient is φ = 168833824.

The previous prime is 211042261. The next prime is 211042289. The reversal of 211042285 is 582240112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 121815369 + 89226916 = 11037^2 + 9446^2 .

It is a cyclic number.

It is not a de Polignac number, because 211042285 - 2⁹ = 211041773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211042289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21104224 + ... + 21104233.

It is an arithmetic number, because the mean of its divisors is an integer number (63312687).

Almost surely, 2^211042285 is an apocalyptic number.

It is an amenable number.

211042285 is a deficient number, since it is larger than the sum of its proper divisors (42208463).

211042285 is an equidigital number, since it uses as much as digits as its factorization.

211042285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42208462.

The product of its (nonzero) digits is 1280, while the sum is 25.

The square root of 211042285 is about 14527.2944831445. The cubic root of 211042285 is about 595.3739475452.

Adding to 211042285 its reverse (582240112), we get a palindrome (793282397).

The spelling of 211042285 in words is "two hundred eleven million, forty-two thousand, two hundred eighty-five".