21424434241 has 8 divisors (see below), whose sum is σ = 24486033024. Its totient is φ = 18363076800.

The previous prime is 21424434191. The next prime is 21424434271. The reversal of 21424434241 is 14243442412.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21424434241 - 2¹¹ = 21424432193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21424434271) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 211641 + ... + 296041.

It is an arithmetic number, because the mean of its divisors is an integer number (3060754128).

Almost surely, 2^21424434241 is an apocalyptic number.

It is an amenable number.

21424434241 is a deficient number, since it is larger than the sum of its proper divisors (3061598783).

21424434241 is an equidigital number, since it uses as much as digits as its factorization.

21424434241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120671.

The product of its digits is 24576, while the sum is 31.

Adding to 21424434241 its reverse (14243442412), we get a palindrome (35667876653).

The spelling of 21424434241 in words is "twenty-one billion, four hundred twenty-four million, four hundred thirty-four thousand, two hundred forty-one".