217106011 has 4 divisors (see below), whose sum is σ = 222155032. Its totient is φ = 212056992.

The previous prime is 217105991. The next prime is 217106023. The reversal of 217106011 is 110601712.

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

It is a cyclic number.

It is not a de Polignac number, because 217106011 - 2⁵ = 217105979 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 217106011.

It is not an unprimeable number, because it can be changed into a prime (217106041) 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, 2524446 + ... + 2524531.

It is an arithmetic number, because the mean of its divisors is an integer number (55538758).

Almost surely, 2^217106011 is an apocalyptic number.

217106011 is a deficient number, since it is larger than the sum of its proper divisors (5049021).

217106011 is an equidigital number, since it uses as much as digits as its factorization.

217106011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5049020.

The product of its (nonzero) digits is 84, while the sum is 19.

The square root of 217106011 is about 14734.5176711014. The cubic root of 217106011 is about 601.0223413003.

Adding to 217106011 its reverse (110601712), we get a palindrome (327707723).

The spelling of 217106011 in words is "two hundred seventeen million, one hundred six thousand, eleven".