23221543 has 4 divisors (see below), whose sum is σ = 23254560. Its totient is φ = 23188528.

The previous prime is 23221537. The next prime is 23221631. The reversal of 23221543 is 34512232.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 23221543 - 2²¹ = 21124391 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 (23221843) 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, 15430 + ... + 16867.

It is an arithmetic number, because the mean of its divisors is an integer number (5813640).

Almost surely, 2^23221543 is an apocalyptic number.

23221543 is a deficient number, since it is larger than the sum of its proper divisors (33017).

23221543 is an equidigital number, since it uses as much as digits as its factorization.

23221543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33016.

The product of its digits is 1440, while the sum is 22.

The square root of 23221543 is about 4818.8736235764. The cubic root of 23221543 is about 285.2968815647.

Adding to 23221543 its reverse (34512232), we get a palindrome (57733775).

The spelling of 23221543 in words is "twenty-three million, two hundred twenty-one thousand, five hundred forty-three".