21492382173 has 8 divisors (see below), whose sum is σ = 28658581536. Its totient is φ = 14327218800.

The previous prime is 21492382159. The next prime is 21492382187. The reversal of 21492382173 is 37128329412.

It is an interprime number because it is at equal distance from previous prime (21492382159) and next prime (21492382187).

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

It is not a de Polignac number, because 21492382173 - 2⁴ = 21492382157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21492382273) 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 7 ways as a sum of consecutive naturals, for example, 209223 + ... + 294548.

It is an arithmetic number, because the mean of its divisors is an integer number (3582322692).

Almost surely, 2^21492382173 is an apocalyptic number.

It is an amenable number.

21492382173 is a deficient number, since it is larger than the sum of its proper divisors (7166199363).

21492382173 is a wasteful number, since it uses less digits than its factorization.

21492382173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 517995.

The product of its digits is 145152, while the sum is 42.

The spelling of 21492382173 in words is "twenty-one billion, four hundred ninety-two million, three hundred eighty-two thousand, one hundred seventy-three".