221147271 has 12 divisors (see below), whose sum is σ = 338225472. Its totient is φ = 138758976.

The previous prime is 221147239. The next prime is 221147287. The reversal of 221147271 is 172741122.

It is a happy number.

221147271 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 221147271 - 2⁵ = 221147239 is a prime.

It is a super-2 number, since 2×221147271² = 97812230941494882, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221147221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 722551 + ... + 722856.

It is an arithmetic number, because the mean of its divisors is an integer number (28185456).

Almost surely, 2^221147271 is an apocalyptic number.

221147271 is a deficient number, since it is larger than the sum of its proper divisors (117078201).

221147271 is a wasteful number, since it uses less digits than its factorization.

221147271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1445430 (or 1445427 counting only the distinct ones).

The product of its digits is 1568, while the sum is 27.

The square root of 221147271 is about 14871.0211821515. The cubic root of 221147271 is about 604.7286272410.

Adding to 221147271 its reverse (172741122), we get a palindrome (393888393).

The spelling of 221147271 in words is "two hundred twenty-one million, one hundred forty-seven thousand, two hundred seventy-one".