21375055342171 has 4 divisors (see below), whose sum is σ = 21442484539152. Its totient is φ = 21307626145192.

The previous prime is 21375055342163. The next prime is 21375055342177. The reversal of 21375055342171 is 17124355057312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21375055342171 - 2³ = 21375055342163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21375055342177) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33714598015 + ... + 33714598648.

It is an arithmetic number, because the mean of its divisors is an integer number (5360621134788).

Almost surely, 2^{21375055342171} is an apocalyptic number.

21375055342171 is a deficient number, since it is larger than the sum of its proper divisors (67429196981).

21375055342171 is an equidigital number, since it uses as much as digits as its factorization.

21375055342171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67429196980.

The product of its (nonzero) digits is 882000, while the sum is 46.

The spelling of 21375055342171 in words is "twenty-one trillion, three hundred seventy-five billion, fifty-five million, three hundred forty-two thousand, one hundred seventy-one".