211551066 has 24 divisors (see below), whose sum is σ = 459837300. Its totient is φ = 70289856.

The previous prime is 211551023. The next prime is 211551071. The reversal of 211551066 is 660155112.

It is a happy number.

211551066 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 169754841 + 41796225 = 13029^2 + 6465^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13141 + ... + 24408.

Almost surely, 2^211551066 is an apocalyptic number.

211551066 is an abundant number, since it is smaller than the sum of its proper divisors (248286234).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

211551066 is a wasteful number, since it uses less digits than its factorization.

211551066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37870 (or 37867 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 211551066 is about 14544.7951515310. The cubic root of 211551066 is about 595.8520063306.

It can be divided in two parts, 21155106 and 6, that added together give a palindrome (21155112).

The spelling of 211551066 in words is "two hundred eleven million, five hundred fifty-one thousand, sixty-six".