211305242 has 8 divisors (see below), whose sum is σ = 317582100. Its totient is φ = 105444544.

The previous prime is 211305229. The next prime is 211305277. The reversal of 211305242 is 242503112.

It can be written as a sum of positive squares in 2 ways, for example, as 207388801 + 3916441 = 14401^2 + 1979^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 102767 + ... + 104802.

Almost surely, 2^211305242 is an apocalyptic number.

211305242 is a deficient number, since it is larger than the sum of its proper divisors (106276858).

211305242 is a wasteful number, since it uses less digits than its factorization.

211305242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208080.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 211305242 is about 14536.3421120996. The cubic root of 211305242 is about 595.6211219742.

Adding to 211305242 its reverse (242503112), we get a palindrome (453808354).

The spelling of 211305242 in words is "two hundred eleven million, three hundred five thousand, two hundred forty-two".