221424543 has 16 divisors (see below), whose sum is σ = 328608000. Its totient is φ = 147359160.

The previous prime is 221424527. The next prime is 221424551. The reversal of 221424543 is 345424122.

It is not a de Polignac number, because 221424543 - 2⁴ = 221424527 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221424503) 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 15 ways as a sum of consecutive naturals, for example, 9328 + ... + 23018.

It is an arithmetic number, because the mean of its divisors is an integer number (20538000).

Almost surely, 2^221424543 is an apocalyptic number.

221424543 is a deficient number, since it is larger than the sum of its proper divisors (107183457).

221424543 is a wasteful number, since it uses less digits than its factorization.

221424543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14299 (or 14293 counting only the distinct ones).

The product of its digits is 7680, while the sum is 27.

The square root of 221424543 is about 14880.3408227097. The cubic root of 221424543 is about 604.9812557087.

Adding to 221424543 its reverse (345424122), we get a palindrome (566848665).

The spelling of 221424543 in words is "two hundred twenty-one million, four hundred twenty-four thousand, five hundred forty-three".