221041543 has 4 divisors (see below), whose sum is σ = 226182088. Its totient is φ = 215901000.

The previous prime is 221041511. The next prime is 221041547. The reversal of 221041543 is 345140122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 345140122 = 2 ⋅172570061.

It is a cyclic number.

It is not a de Polignac number, because 221041543 - 2⁵ = 221041511 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 (221041547) 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, 2570208 + ... + 2570293.

It is an arithmetic number, because the mean of its divisors is an integer number (56545522).

Almost surely, 2^221041543 is an apocalyptic number.

221041543 is a deficient number, since it is larger than the sum of its proper divisors (5140545).

221041543 is an equidigital number, since it uses as much as digits as its factorization.

221041543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5140544.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 221041543 is about 14867.4659239562. The cubic root of 221041543 is about 604.6322405814.

Adding to 221041543 its reverse (345140122), we get a palindrome (566181665).

The spelling of 221041543 in words is "two hundred twenty-one million, forty-one thousand, five hundred forty-three".