2105171500 has 144 divisors (see below), whose sum is σ = 4942697760. Its totient is φ = 783043200.

The previous prime is 2105171491. The next prime is 2105171521. The reversal of 2105171500 is 51715012.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 19313446 + ... + 19313554.

It is an arithmetic number, because the mean of its divisors is an integer number (34324290).

Almost surely, 2^2105171500 is an apocalyptic number.

2105171500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2105171500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2471348880).

2105171500 is an abundant number, since it is smaller than the sum of its proper divisors (2837526260).

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

2105171500 is a wasteful number, since it uses less digits than its factorization.

2105171500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273 (or 242 counting only the distinct ones).

The product of its (nonzero) digits is 350, while the sum is 22.

The square root of 2105171500 is about 45882.1479444893. The cubic root of 2105171500 is about 1281.6294961515.

Adding to 2105171500 its reverse (51715012), we get a palindrome (2156886512).

The spelling of 2105171500 in words is "two billion, one hundred five million, one hundred seventy-one thousand, five hundred".