2216726171821 has 6 divisors (see below), whose sum is σ = 2578640648910. Its totient is φ = 1900051004376.

The previous prime is 2216726171801. The next prime is 2216726171827. The reversal of 2216726171821 is 1281716276122.

It can be written as a sum of positive squares in only one way, i.e., 1847778048900 + 368948122921 = 1359330^2 + 607411^2 .

It is not a de Polignac number, because 2216726171821 - 2⁵ = 2216726171789 is a prime.

It is a super-2 number, since 2×2216726171821² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2216726171827) 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 5 ways as a sum of consecutive naturals, for example, 22619654766 + ... + 22619654863.

It is an arithmetic number, because the mean of its divisors is an integer number (429773441485).

Almost surely, 2^{2216726171821} is an apocalyptic number.

It is an amenable number.

2216726171821 is a deficient number, since it is larger than the sum of its proper divisors (361914477089).

2216726171821 is an equidigital number, since it uses as much as digits as its factorization.

2216726171821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45239309643 (or 45239309636 counting only the distinct ones).

The product of its digits is 225792, while the sum is 46.

The spelling of 2216726171821 in words is "two trillion, two hundred sixteen billion, seven hundred twenty-six million, one hundred seventy-one thousand, eight hundred twenty-one".