23563421 has 4 divisors (see below), whose sum is σ = 26929632. Its totient is φ = 20197212.

The previous prime is 23563349. The next prime is 23563469. The reversal of 23563421 is 12436532.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 23563421 - 2²² = 19369117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23563471) 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, 1683095 + ... + 1683108.

It is an arithmetic number, because the mean of its divisors is an integer number (6732408).

Almost surely, 2^23563421 is an apocalyptic number.

It is an amenable number.

23563421 is a deficient number, since it is larger than the sum of its proper divisors (3366211).

23563421 is an equidigital number, since it uses as much as digits as its factorization.

23563421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3366210.

The product of its digits is 4320, while the sum is 26.

The square root of 23563421 is about 4854.2168266364. The cubic root of 23563421 is about 286.6901559684.

Adding to 23563421 its reverse (12436532), we get a palindrome (35999953).

The spelling of 23563421 in words is "twenty-three million, five hundred sixty-three thousand, four hundred twenty-one".