24205421 has 2 divisors, whose sum is σ = 24205422. Its totient is φ = 24205420.

The previous prime is 24205417. The next prime is 24205483. The reversal of 24205421 is 12450242.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13875625 + 10329796 = 3725^2 + 3214^2 .

It is a cyclic number.

It is not a de Polignac number, because 24205421 - 2² = 24205417 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 24205393 and 24205402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (24205921) 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, 12102710 + 12102711.

It is an arithmetic number, because the mean of its divisors is an integer number (12102711).

Almost surely, 2^24205421 is an apocalyptic number.

It is an amenable number.

24205421 is a deficient number, since it is larger than the sum of its proper divisors (1).

24205421 is an equidigital number, since it uses as much as digits as its factorization.

24205421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 24205421 is about 4919.9005071241. The cubic root of 24205421 is about 289.2705448154.

Adding to 24205421 its reverse (12450242), we get a palindrome (36655663).

The spelling of 24205421 in words is "twenty-four million, two hundred five thousand, four hundred twenty-one".