21724238174 has 16 divisors (see below), whose sum is σ = 32773884000. Its totient is φ = 10799689824.

The previous prime is 21724238153. The next prime is 21724238189. The reversal of 21724238174 is 47183242712.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 549644 + ... + 587840.

It is an arithmetic number, because the mean of its divisors is an integer number (2048367750).

Almost surely, 2^21724238174 is an apocalyptic number.

21724238174 is a deficient number, since it is larger than the sum of its proper divisors (11049645826).

21724238174 is a wasteful number, since it uses less digits than its factorization.

21724238174 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39827.

The product of its digits is 150528, while the sum is 41.

The spelling of 21724238174 in words is "twenty-one billion, seven hundred twenty-four million, two hundred thirty-eight thousand, one hundred seventy-four".