21761130171 has 48 divisors (see below), whose sum is σ = 34056852480. Its totient is φ = 12322833600.

The previous prime is 21761130151. The next prime is 21761130221. The reversal of 21761130171 is 17103116712.

It is not a de Polignac number, because 21761130171 - 2⁹ = 21761129659 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21761130151) 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 47 ways as a sum of consecutive naturals, for example, 292996 + ... + 359678.

It is an arithmetic number, because the mean of its divisors is an integer number (709517760).

Almost surely, 2^21761130171 is an apocalyptic number.

21761130171 is a deficient number, since it is larger than the sum of its proper divisors (12295722309).

21761130171 is a wasteful number, since it uses less digits than its factorization.

21761130171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66768 (or 66757 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 30.

Adding to 21761130171 its reverse (17103116712), we get a palindrome (38864246883).

The spelling of 21761130171 in words is "twenty-one billion, seven hundred sixty-one million, one hundred thirty thousand, one hundred seventy-one".