216611242171 has 4 divisors (see below), whose sum is σ = 217517565600. Its totient is φ = 215704918744.

The previous prime is 216611242123. The next prime is 216611242187. The reversal of 216611242171 is 171242116612.

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 216611242171 - 2²³ = 216602853563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216611242571) 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, 453161356 + ... + 453161833.

It is an arithmetic number, because the mean of its divisors is an integer number (54379391400).

Almost surely, 2^216611242171 is an apocalyptic number.

216611242171 is a deficient number, since it is larger than the sum of its proper divisors (906323429).

216611242171 is an equidigital number, since it uses as much as digits as its factorization.

216611242171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 906323428.

The product of its digits is 8064, while the sum is 34.

Adding to 216611242171 its reverse (171242116612), we get a palindrome (387853358783).

The spelling of 216611242171 in words is "two hundred sixteen billion, six hundred eleven million, two hundred forty-two thousand, one hundred seventy-one".