221641541 has 8 divisors (see below), whose sum is σ = 241899168. Its totient is φ = 201402000.

The previous prime is 221641493. The next prime is 221641549. The reversal of 221641541 is 145146122.

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

It is a cyclic number.

It is not a de Polignac number, because 221641541 - 2¹⁸ = 221379397 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221641541.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221641549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41726 + ... + 46736.

It is an arithmetic number, because the mean of its divisors is an integer number (30237396).

Almost surely, 2^221641541 is an apocalyptic number.

It is an amenable number.

221641541 is a deficient number, since it is larger than the sum of its proper divisors (20257627).

221641541 is a wasteful number, since it uses less digits than its factorization.

221641541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9043.

The product of its digits is 1920, while the sum is 26.

The square root of 221641541 is about 14887.6304696214. The cubic root of 221641541 is about 605.1788201686.

Adding to 221641541 its reverse (145146122), we get a palindrome (366787663).

The spelling of 221641541 in words is "two hundred twenty-one million, six hundred forty-one thousand, five hundred forty-one".