2105821716 has 12 divisors (see below), whose sum is σ = 4913584032. Its totient is φ = 701940568.

The previous prime is 2105821639. The next prime is 2105821721. The reversal of 2105821716 is 6171285012.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87742560 + ... + 87742583.

It is an arithmetic number, because the mean of its divisors is an integer number (409465336).

Almost surely, 2^2105821716 is an apocalyptic number.

It is an amenable number.

2105821716 is an abundant number, since it is smaller than the sum of its proper divisors (2807762316).

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

2105821716 is a wasteful number, since it uses less digits than its factorization.

2105821716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175485150 (or 175485148 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 33.

The square root of 2105821716 is about 45889.2331162769. The cubic root of 2105821716 is about 1281.7614331809.

The spelling of 2105821716 in words is "two billion, one hundred five million, eight hundred twenty-one thousand, seven hundred sixteen".