211306066 has 4 divisors (see below), whose sum is σ = 316959102. Its totient is φ = 105653032.

The previous prime is 211306057. The next prime is 211306091. The reversal of 211306066 is 660603112.

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

It can be written as a sum of positive squares in only one way, i.e., 209815225 + 1490841 = 14485^2 + 1221^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 211306066.

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 as a sum of consecutive naturals, namely, 52826515 + ... + 52826518.

Almost surely, 2^211306066 is an apocalyptic number.

211306066 is a deficient number, since it is larger than the sum of its proper divisors (105653036).

211306066 is a wasteful number, since it uses less digits than its factorization.

211306066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105653035.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 211306066 is about 14536.3704548281. The cubic root of 211306066 is about 595.6218961957.

Adding to 211306066 its reverse (660603112), we get a palindrome (871909178).

The spelling of 211306066 in words is "two hundred eleven million, three hundred six thousand, sixty-six".