2171091523068 has 144 divisors (see below), whose sum is σ = 5943749849856. Its totient is φ = 664238776320.

The previous prime is 2171091522997. The next prime is 2171091523087. The reversal of 2171091523068 is 8603251901712.

2171091523068 is a `hidden beast` number, since 2 + 17 + 109 + 1 + 523 + 0 + 6 + 8 = 666.

It is a super-2 number, since 2×2171091523068² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 234024846 + ... + 234034122.

It is an arithmetic number, because the mean of its divisors is an integer number (41276040624).

Almost surely, 2^{2171091523068} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2171091523068, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2971874924928).

2171091523068 is an abundant number, since it is smaller than the sum of its proper divisors (3772658326788).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2171091523068 is a wasteful number, since it uses less digits than its factorization.

2171091523068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12084 (or 12079 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 45.

The spelling of 2171091523068 in words is "two trillion, one hundred seventy-one billion, ninety-one million, five hundred twenty-three thousand, sixty-eight".