24421721 has 4 divisors (see below), whose sum is σ = 24989712. Its totient is φ = 23853732.

The previous prime is 24421687. The next prime is 24421723. The reversal of 24421721 is 12712442.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-24421721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (24421723) 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 in 3 ways as a sum of consecutive naturals, for example, 283931 + ... + 284016.

It is an arithmetic number, because the mean of its divisors is an integer number (6247428).

Almost surely, 2^24421721 is an apocalyptic number.

It is an amenable number.

24421721 is a deficient number, since it is larger than the sum of its proper divisors (567991).

24421721 is an equidigital number, since it uses as much as digits as its factorization.

24421721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 567990.

The product of its digits is 896, while the sum is 23.

The square root of 24421721 is about 4941.8337689566. The cubic root of 24421721 is about 290.1296328884.

The spelling of 24421721 in words is "twenty-four million, four hundred twenty-one thousand, seven hundred twenty-one".