217101228 has 12 divisors (see below), whose sum is σ = 506569560. Its totient is φ = 72367072.

The previous prime is 217101223. The next prime is 217101317. The reversal of 217101228 is 822101712.

217101228 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 217101198 and 217101207.

It is not an unprimeable number, because it can be changed into a prime (217101223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9045873 + ... + 9045896.

It is an arithmetic number, because the mean of its divisors is an integer number (42214130).

Almost surely, 2^217101228 is an apocalyptic number.

It is an amenable number.

217101228 is an abundant number, since it is smaller than the sum of its proper divisors (289468332).

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

217101228 is a wasteful number, since it uses less digits than its factorization.

217101228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18091776 (or 18091774 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 24.

The square root of 217101228 is about 14734.3553642499. The cubic root of 217101228 is about 601.0179276179.

The spelling of 217101228 in words is "two hundred seventeen million, one hundred one thousand, two hundred twenty-eight".