211000066 has 4 divisors (see below), whose sum is σ = 316500102. Its totient is φ = 105500032.

The previous prime is 211000051. The next prime is 211000109. The reversal of 211000066 is 660000112.

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., 210859441 + 140625 = 14521^2 + 375^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52750015 + ... + 52750018.

Almost surely, 2^211000066 is an apocalyptic number.

211000066 is a deficient number, since it is larger than the sum of its proper divisors (105500036).

211000066 is a wasteful number, since it uses less digits than its factorization.

211000066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105500035.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 211000066 is about 14525.8413181475. The cubic root of 211000066 is about 595.3342433867.

Adding to 211000066 its reverse (660000112), we get a palindrome (871000178).

The spelling of 211000066 in words is "two hundred eleven million, sixty-six", and thus it is an aban number.