4221421543 has 4 divisors (see below), whose sum is σ = 4221552168. Its totient is φ = 4221290920.

The previous prime is 4221421517. The next prime is 4221421549. The reversal of 4221421543 is 3451241224.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 4221421543 - 2¹⁷ = 4221290471 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 (4221421549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22680 + ... + 94642.

It is an arithmetic number, because the mean of its divisors is an integer number (1055388042).

Almost surely, 2^4221421543 is an apocalyptic number.

4221421543 is a deficient number, since it is larger than the sum of its proper divisors (130625).

4221421543 is an equidigital number, since it uses as much as digits as its factorization.

4221421543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130624.

The product of its digits is 7680, while the sum is 28.

The square root of 4221421543 is about 64972.4675766590. The cubic root of 4221421543 is about 1616.1670219926.

Adding to 4221421543 its reverse (3451241224), we get a palindrome (7672662767).

The spelling of 4221421543 in words is "four billion, two hundred twenty-one million, four hundred twenty-one thousand, five hundred forty-three".