24036721 has 2 divisors, whose sum is σ = 24036722. Its totient is φ = 24036720.

The previous prime is 24036709. The next prime is 24036731. The reversal of 24036721 is 12763042.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23658496 + 378225 = 4864^2 + 615^2 .

It is a cyclic number.

It is not a de Polignac number, because 24036721 - 2⁵ = 24036689 is a prime.

It is not a weakly prime, because it can be changed into another prime (24036731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12018360 + 12018361.

It is an arithmetic number, because the mean of its divisors is an integer number (12018361).

Almost surely, 2^24036721 is an apocalyptic number.

It is an amenable number.

24036721 is a deficient number, since it is larger than the sum of its proper divisors (1).

24036721 is an equidigital number, since it uses as much as digits as its factorization.

24036721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 24036721 is about 4902.7258744498. The cubic root of 24036721 is about 288.5969525577.

Adding to 24036721 its reverse (12763042), we get a palindrome (36799763).

The spelling of 24036721 in words is "twenty-four million, thirty-six thousand, seven hundred twenty-one".