21742344171 has 24 divisors (see below), whose sum is σ = 32433514880. Its totient is φ = 14020905600.

The previous prime is 21742344161. The next prime is 21742344181. The reversal of 21742344171 is 17144324712.

21742344171 is a `hidden beast` number, since 2 + 1 + 7 + 4 + 234 + 417 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (21742344161) and next prime (21742344181).

It is not a de Polignac number, because 21742344171 - 2¹⁵ = 21742311403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21742344101) 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 23 ways as a sum of consecutive naturals, for example, 636495 + ... + 669783.

Almost surely, 2^21742344171 is an apocalyptic number.

21742344171 is a deficient number, since it is larger than the sum of its proper divisors (10691170709).

21742344171 is a wasteful number, since it uses less digits than its factorization.

21742344171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35667 (or 35664 counting only the distinct ones).

The product of its digits is 37632, while the sum is 36.

Adding to 21742344171 its reverse (17144324712), we get a palindrome (38886668883).

The spelling of 21742344171 in words is "twenty-one billion, seven hundred forty-two million, three hundred forty-four thousand, one hundred seventy-one".