23543421 has 16 divisors (see below), whose sum is σ = 35735040. Its totient is φ = 13647920.

The previous prime is 23543411. The next prime is 23543423. The reversal of 23543421 is 12434532.

It is not a de Polignac number, because 23543421 - 2⁷ = 23543293 is a prime.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 23543391 and 23543400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23543423) 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, 14751 + ... + 16268.

It is an arithmetic number, because the mean of its divisors is an integer number (2233440).

Almost surely, 2^23543421 is an apocalyptic number.

It is an amenable number.

23543421 is a deficient number, since it is larger than the sum of its proper divisors (12191619).

23543421 is a wasteful number, since it uses less digits than its factorization.

23543421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31056.

The product of its digits is 2880, while the sum is 24.

The square root of 23543421 is about 4852.1563247694. The cubic root of 23543421 is about 286.6090213697.

Adding to 23543421 its reverse (12434532), we get a palindrome (35977953).

Subtracting from 23543421 its reverse (12434532), we obtain a square (11108889 = 3333²).

It can be divided in two parts, 2354 and 3421, that added together give a palindrome (5775).

The spelling of 23543421 in words is "twenty-three million, five hundred forty-three thousand, four hundred twenty-one".