21138817344271 has 32 divisors (see below), whose sum is σ = 24932504574720. Its totient is φ = 17712068601600.

The previous prime is 21138817344143. The next prime is 21138817344313. The reversal of 21138817344271 is 17244371883112.

It is not a de Polignac number, because 21138817344271 - 2⁷ = 21138817344143 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21138817344371) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 91884616 + ... + 92114386.

It is an arithmetic number, because the mean of its divisors is an integer number (779140767960).

Almost surely, 2^{21138817344271} is an apocalyptic number.

21138817344271 is a deficient number, since it is larger than the sum of its proper divisors (3793687230449).

21138817344271 is a wasteful number, since it uses less digits than its factorization.

21138817344271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241735.

The product of its digits is 1806336, while the sum is 52.

The spelling of 21138817344271 in words is "twenty-one trillion, one hundred thirty-eight billion, eight hundred seventeen million, three hundred forty-four thousand, two hundred seventy-one".