24081221 has 2 divisors, whose sum is σ = 24081222. Its totient is φ = 24081220.

The previous prime is 24081209. The next prime is 24081229. The reversal of 24081221 is 12218042.

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., 19624900 + 4456321 = 4430^2 + 2111^2 .

It is a cyclic number.

It is not a de Polignac number, because 24081221 - 2¹⁸ = 23819077 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 24081193 and 24081202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (24081229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12040610 + 12040611.

It is an arithmetic number, because the mean of its divisors is an integer number (12040611).

Almost surely, 2^24081221 is an apocalyptic number.

It is an amenable number.

24081221 is a deficient number, since it is larger than the sum of its proper divisors (1).

24081221 is an equidigital number, since it uses as much as digits as its factorization.

24081221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 24081221 is about 4907.2620675892. The cubic root of 24081221 is about 288.7749392201.

Adding to 24081221 its reverse (12218042), we get a palindrome (36299263).

The spelling of 24081221 in words is "twenty-four million, eighty-one thousand, two hundred twenty-one".