543420221 has 8 divisors (see below), whose sum is σ = 558406200. Its totient is φ = 528450048.

The previous prime is 543420217. The next prime is 543420233. The reversal of 543420221 is 122024345.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 13039321 + 530380900 = 3611^2 + 23030^2 .

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 543420221 - 2² = 543420217 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 (543420211) 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, 110405 + ... + 115221.

It is an arithmetic number, because the mean of its divisors is an integer number (69800775).

Almost surely, 2^543420221 is an apocalyptic number.

It is an amenable number.

543420221 is a deficient number, since it is larger than the sum of its proper divisors (14985979).

543420221 is a wasteful number, since it uses less digits than its factorization.

543420221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7903.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 543420221 is about 23311.3753562504. The cubic root of 543420221 is about 816.0409101982.

Adding to 543420221 its reverse (122024345), we get a palindrome (665444566).

The spelling of 543420221 in words is "five hundred forty-three million, four hundred twenty thousand, two hundred twenty-one".