211228018 has 4 divisors (see below), whose sum is σ = 316842030. Its totient is φ = 105614008.

The previous prime is 211228007. The next prime is 211228049. The reversal of 211228018 is 810822112.

211228018 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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., 119968209 + 91259809 = 10953^2 + 9553^2 .

It is a junction number, because it is equal to n+sod(n) for n = 211227983 and 211228001.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52807003 + ... + 52807006.

Almost surely, 2^211228018 is an apocalyptic number.

211228018 is a deficient number, since it is larger than the sum of its proper divisors (105614012).

211228018 is a wasteful number, since it uses less digits than its factorization.

211228018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105614011.

The product of its (nonzero) digits is 512, while the sum is 25.

The square root of 211228018 is about 14533.6856302866. The cubic root of 211228018 is about 595.5485542052.

The spelling of 211228018 in words is "two hundred eleven million, two hundred twenty-eight thousand, eighteen".