24012221 has 2 divisors, whose sum is σ = 24012222. Its totient is φ = 24012220.

The previous prime is 24012217. The next prime is 24012239. The reversal of 24012221 is 12221042.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23863225 + 148996 = 4885^2 + 386^2 .

It is a cyclic number.

It is not a de Polignac number, because 24012221 - 2² = 24012217 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 24012196 and 24012205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (24032221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12006110 + 12006111.

It is an arithmetic number, because the mean of its divisors is an integer number (12006111).

Almost surely, 2^24012221 is an apocalyptic number.

It is an amenable number.

24012221 is a deficient number, since it is larger than the sum of its proper divisors (1).

24012221 is an equidigital number, since it uses as much as digits as its factorization.

24012221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 24012221 is about 4900.2266274122. The cubic root of 24012221 is about 288.4988661202.

Adding to 24012221 its reverse (12221042), we get a palindrome (36233263).

The spelling of 24012221 in words is "twenty-four million, twelve thousand, two hundred twenty-one".