221271271 has 4 divisors (see below), whose sum is σ = 238292152. Its totient is φ = 204250392.

The previous prime is 221271263. The next prime is 221271313. The reversal of 221271271 is 172172122.

221271271 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 is a cyclic number.

It is not a de Polignac number, because 221271271 - 2³ = 221271263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221271221) 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, 8510421 + ... + 8510446.

It is an arithmetic number, because the mean of its divisors is an integer number (59573038).

Almost surely, 2^221271271 is an apocalyptic number.

221271271 is a deficient number, since it is larger than the sum of its proper divisors (17020881).

221271271 is a wasteful number, since it uses less digits than its factorization.

221271271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17020880.

The product of its digits is 784, while the sum is 25.

The square root of 221271271 is about 14875.1897803020. The cubic root of 221271271 is about 604.8416323869.

The spelling of 221271271 in words is "two hundred twenty-one million, two hundred seventy-one thousand, two hundred seventy-one".