23543221 has 6 divisors (see below), whose sum is σ = 25493730. Its totient is φ = 21732048.

The previous prime is 23543171. The next prime is 23543243. The reversal of 23543221 is 12234532.

It can be written as a sum of positive squares in 3 ways, for example, as 790321 + 22752900 = 889^2 + 4770^2 .

It is not a de Polignac number, because 23543221 - 2¹¹ = 23541173 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23543192 and 23543201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23543281) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 69486 + ... + 69823.

It is an arithmetic number, because the mean of its divisors is an integer number (4248955).

Almost surely, 2^23543221 is an apocalyptic number.

It is an amenable number.

23543221 is a deficient number, since it is larger than the sum of its proper divisors (1950509).

23543221 is a wasteful number, since it uses less digits than its factorization.

23543221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139335 (or 139322 counting only the distinct ones).

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

The square root of 23543221 is about 4852.1357153320. The cubic root of 23543221 is about 286.6082097918.

Adding to 23543221 its reverse (12234532), we get a palindrome (35777753).

The spelling of 23543221 in words is "twenty-three million, five hundred forty-three thousand, two hundred twenty-one".