221261171 has 16 divisors (see below), whose sum is σ = 239057280. Its totient is φ = 204042240.

The previous prime is 221261153. The next prime is 221261179. The reversal of 221261171 is 171162122.

221261171 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221261171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221261179) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 179126 + ... + 180356.

It is an arithmetic number, because the mean of its divisors is an integer number (14941080).

Almost surely, 2^221261171 is an apocalyptic number.

221261171 is a deficient number, since it is larger than the sum of its proper divisors (17796109).

221261171 is a wasteful number, since it uses less digits than its factorization.

221261171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1454.

The product of its digits is 336, while the sum is 23.

The square root of 221261171 is about 14874.8502849609. The cubic root of 221261171 is about 604.8324295151.

The spelling of 221261171 in words is "two hundred twenty-one million, two hundred sixty-one thousand, one hundred seventy-one".