21200272425171 has 48 divisors (see below), whose sum is σ = 35018511390720. Its totient is φ = 12107092308480.

The previous prime is 21200272425109. The next prime is 21200272425179. The reversal of 21200272425171 is 17152427200212.

21200272425171 is a `hidden beast` number, since 2 + 1 + 200 + 27 + 2 + 425 + 1 + 7 + 1 = 666.

It is not a de Polignac number, because 21200272425171 - 2⁹ = 21200272424659 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21200272425179) 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, 1469071326 + ... + 1469085756.

It is an arithmetic number, because the mean of its divisors is an integer number (729552320640).

Almost surely, 2^{21200272425171} is an apocalyptic number.

21200272425171 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21200272425171 is a deficient number, since it is larger than the sum of its proper divisors (13818238965549).

21200272425171 is a wasteful number, since it uses less digits than its factorization.

21200272425171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26976 (or 26973 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 36.

Adding to 21200272425171 its reverse (17152427200212), we get a palindrome (38352699625383).

The spelling of 21200272425171 in words is "twenty-one trillion, two hundred billion, two hundred seventy-two million, four hundred twenty-five thousand, one hundred seventy-one".