20424414421 has 4 divisors (see below), whose sum is σ = 20429198572. Its totient is φ = 20419630272.

The previous prime is 20424414403. The next prime is 20424414433. The reversal of 20424414421 is 12441442402.

It is a happy number.

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 5530896900 + 14893517521 = 74370^2 + 122039^2 .

It is a cyclic number.

It is not a de Polignac number, because 20424414421 - 2¹³ = 20424406229 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20424414421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20424414221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2385666 + ... + 2394211.

It is an arithmetic number, because the mean of its divisors is an integer number (5107299643).

Almost surely, 2^20424414421 is an apocalyptic number.

It is an amenable number.

20424414421 is a deficient number, since it is larger than the sum of its proper divisors (4784151).

20424414421 is an equidigital number, since it uses as much as digits as its factorization.

20424414421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4784150.

The product of its (nonzero) digits is 8192, while the sum is 28.

Adding to 20424414421 its reverse (12441442402), we get a palindrome (32865856823).

The spelling of 20424414421 in words is "twenty billion, four hundred twenty-four million, four hundred fourteen thousand, four hundred twenty-one".