24563921 has 2 divisors, whose sum is σ = 24563922. Its totient is φ = 24563920.

The previous prime is 24563909. The next prime is 24563923. The reversal of 24563921 is 12936542.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15713296 + 8850625 = 3964^2 + 2975^2 .

It is a cyclic number.

It is not a de Polignac number, because 24563921 - 2²² = 20369617 is a prime.

It is a Sophie Germain prime.

Together with 24563923, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (24563923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12281960 + 12281961.

It is an arithmetic number, because the mean of its divisors is an integer number (12281961).

Almost surely, 2^24563921 is an apocalyptic number.

It is an amenable number.

24563921 is a deficient number, since it is larger than the sum of its proper divisors (1).

24563921 is an equidigital number, since it uses as much as digits as its factorization.

24563921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 32.

The square root of 24563921 is about 4956.2002582624. The cubic root of 24563921 is about 290.6916546696.

The spelling of 24563921 in words is "twenty-four million, five hundred sixty-three thousand, nine hundred twenty-one".