24421421 has 4 divisors (see below), whose sum is σ = 24458172. Its totient is φ = 24384672.

The previous prime is 24421409. The next prime is 24421427. The reversal of 24421421 is 12412442.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 23629321 + 792100 = 4861^2 + 890^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-24421421 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 24421393 and 24421402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (24421427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17360 + ... + 18713.

It is an arithmetic number, because the mean of its divisors is an integer number (6114543).

Almost surely, 2^24421421 is an apocalyptic number.

It is an amenable number.

24421421 is a deficient number, since it is larger than the sum of its proper divisors (36751).

24421421 is an equidigital number, since it uses as much as digits as its factorization.

24421421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36750.

The product of its digits is 512, while the sum is 20.

The square root of 24421421 is about 4941.8034157583. The cubic root of 24421421 is about 290.1284448852.

Adding to 24421421 its reverse (12412442), we get a palindrome (36833863).

It can be divided in two parts, 24421 and 421, that added together give a palindrome (24842).

The spelling of 24421421 in words is "twenty-four million, four hundred twenty-one thousand, four hundred twenty-one".