21101171671 has 8 divisors (see below), whose sum is σ = 21460063104. Its totient is φ = 20743994040.

The previous prime is 21101171629. The next prime is 21101171701. The reversal of 21101171671 is 17617110112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21101171671 - 2²⁵ = 21067617239 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101171621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 403605 + ... + 452878.

It is an arithmetic number, because the mean of its divisors is an integer number (2682507888).

Almost surely, 2^21101171671 is an apocalyptic number.

21101171671 is a deficient number, since it is larger than the sum of its proper divisors (358891433).

21101171671 is an equidigital number, since it uses as much as digits as its factorization.

21101171671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 856901.

The product of its (nonzero) digits is 588, while the sum is 28.

Adding to 21101171671 its reverse (17617110112), we get a palindrome (38718281783).

The spelling of 21101171671 in words is "twenty-one billion, one hundred one million, one hundred seventy-one thousand, six hundred seventy-one".