21424323120401 has 4 divisors (see below), whose sum is σ = 21548163138612. Its totient is φ = 21300483102192.

The previous prime is 21424323120367. The next prime is 21424323120437. The reversal of 21424323120401 is 10402132342412.

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 14595639539776 + 6828683580625 = 3820424^2 + 2613175^2 .

It is a cyclic number.

It is not a de Polignac number, because 21424323120401 - 2²⁶ = 21424256011537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21424323120001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61920008846 + ... + 61920009191.

It is an arithmetic number, because the mean of its divisors is an integer number (5387040784653).

Almost surely, 2^{21424323120401} is an apocalyptic number.

It is an amenable number.

21424323120401 is a deficient number, since it is larger than the sum of its proper divisors (123840018211).

21424323120401 is a wasteful number, since it uses less digits than its factorization.

21424323120401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123840018210.

The product of its (nonzero) digits is 9216, while the sum is 29.

Adding to 21424323120401 its reverse (10402132342412), we get a palindrome (31826455462813).

The spelling of 21424323120401 in words is "twenty-one trillion, four hundred twenty-four billion, three hundred twenty-three million, one hundred twenty thousand, four hundred one".