221641071 has 8 divisors (see below), whose sum is σ = 301097520. Its totient is φ = 144972672.

The previous prime is 221641037. The next prime is 221641081. The reversal of 221641071 is 170146122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 221641071 - 2⁷ = 221640943 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221641001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 696826 + ... + 697143.

It is an arithmetic number, because the mean of its divisors is an integer number (37637190).

Almost surely, 2^221641071 is an apocalyptic number.

221641071 is a deficient number, since it is larger than the sum of its proper divisors (79456449).

221641071 is a wasteful number, since it uses less digits than its factorization.

221641071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1394025.

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 221641071 is about 14887.6146846968. The cubic root of 221641071 is about 605.1783923995.

Adding to 221641071 its reverse (170146122), we get a palindrome (391787193).

The spelling of 221641071 in words is "two hundred twenty-one million, six hundred forty-one thousand, seventy-one".