221423543 has 8 divisors (see below), whose sum is σ = 245159040. Its totient is φ = 198289080.

The previous prime is 221423539. The next prime is 221423561. The reversal of 221423543 is 345324122.

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

It is not a de Polignac number, because 221423543 - 2² = 221423539 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 (221423563) 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, 149483 + ... + 150956.

It is an arithmetic number, because the mean of its divisors is an integer number (30644880).

Almost surely, 2^221423543 is an apocalyptic number.

221423543 is a deficient number, since it is larger than the sum of its proper divisors (23735497).

221423543 is a wasteful number, since it uses less digits than its factorization.

221423543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300517.

The product of its digits is 5760, while the sum is 26.

The square root of 221423543 is about 14880.3072212908. The cubic root of 221423543 is about 604.9803449663.

Adding to 221423543 its reverse (345324122), we get a palindrome (566747665).

The spelling of 221423543 in words is "two hundred twenty-one million, four hundred twenty-three thousand, five hundred forty-three".