21424175173 has 4 divisors (see below), whose sum is σ = 22551763360. Its totient is φ = 20296586988.

The previous prime is 21424175161. The next prime is 21424175273. The reversal of 21424175173 is 37157142412.

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 not a de Polignac number, because 21424175173 - 2⁹ = 21424174661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21424175273) 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, 563794065 + ... + 563794102.

It is an arithmetic number, because the mean of its divisors is an integer number (5637940840).

Almost surely, 2^21424175173 is an apocalyptic number.

It is an amenable number.

21424175173 is a deficient number, since it is larger than the sum of its proper divisors (1127588187).

21424175173 is a wasteful number, since it uses less digits than its factorization.

21424175173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1127588186.

The product of its digits is 47040, while the sum is 37.

The spelling of 21424175173 in words is "twenty-one billion, four hundred twenty-four million, one hundred seventy-five thousand, one hundred seventy-three".