21500232471171 has 48 divisors (see below), whose sum is σ = 32607702429120. Its totient is φ = 13637886013440.

The previous prime is 21500232471163. The next prime is 21500232471257. The reversal of 21500232471171 is 17117423200512.

21500232471171 is a `hidden beast` number, since 2 + 1 + 500 + 2 + 32 + 4 + 7 + 117 + 1 = 666.

It is not a de Polignac number, because 21500232471171 - 2³ = 21500232471163 is a prime.

It is a super-2 number, since 2×21500232471171² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21500232471131) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 25486 + ... + 6557523.

It is an arithmetic number, because the mean of its divisors is an integer number (679327133940).

Almost surely, 2^{21500232471171} is an apocalyptic number.

21500232471171 is a deficient number, since it is larger than the sum of its proper divisors (11107469957949).

21500232471171 is a wasteful number, since it uses less digits than its factorization.

21500232471171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6583276 (or 6583273 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 36.

Adding to 21500232471171 its reverse (17117423200512), we get a palindrome (38617655671683).

The spelling of 21500232471171 in words is "twenty-one trillion, five hundred billion, two hundred thirty-two million, four hundred seventy-one thousand, one hundred seventy-one".