24440021 has 2 divisors, whose sum is σ = 24440022. Its totient is φ = 24440020.

The previous prime is 24439981. The next prime is 24440027. The reversal of 24440021 is 12004442.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17757796 + 6682225 = 4214^2 + 2585^2 .

It is a cyclic number.

It is not a de Polignac number, because 24440021 - 2⁶ = 24439957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (24440027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12220010 + 12220011.

It is an arithmetic number, because the mean of its divisors is an integer number (12220011).

Almost surely, 2^24440021 is an apocalyptic number.

It is an amenable number.

24440021 is a deficient number, since it is larger than the sum of its proper divisors (1).

24440021 is an equidigital number, since it uses as much as digits as its factorization.

24440021 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 17.

The square root of 24440021 is about 4943.6849616455. The cubic root of 24440021 is about 290.2020826920.

Adding to 24440021 its reverse (12004442), we get a palindrome (36444463).

The spelling of 24440021 in words is "twenty-four million, four hundred forty thousand, twenty-one".