21613321371671 has 12 divisors (see below), whose sum is σ = 21695899523976. Its totient is φ = 21531056297040.

The previous prime is 21613321371589. The next prime is 21613321371673. The reversal of 21613321371671 is 17617312331612.

It is not a de Polignac number, because 21613321371671 - 2¹⁰ = 21613321370647 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 (21613321371673) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1229907641 + ... + 1229925213.

It is an arithmetic number, because the mean of its divisors is an integer number (1807991626998).

Almost surely, 2^{21613321371671} is an apocalyptic number.

21613321371671 is a deficient number, since it is larger than the sum of its proper divisors (82578152305).

21613321371671 is an equidigital number, since it uses as much as digits as its factorization.

21613321371671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34862 (or 34591 counting only the distinct ones).

The product of its digits is 190512, while the sum is 44.

The spelling of 21613321371671 in words is "twenty-one trillion, six hundred thirteen billion, three hundred twenty-one million, three hundred seventy-one thousand, six hundred seventy-one".