2105210811 has 16 divisors (see below), whose sum is σ = 3223290240. Its totient is φ = 1208733120.

The previous prime is 2105210797. The next prime is 2105210843. The reversal of 2105210811 is 1180125012.

It is not a de Polignac number, because 2105210811 - 2⁶ = 2105210747 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2105210111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1678170 + ... + 1679423.

It is an arithmetic number, because the mean of its divisors is an integer number (201455640).

Almost surely, 2^2105210811 is an apocalyptic number.

2105210811 is a deficient number, since it is larger than the sum of its proper divisors (1118079429).

2105210811 is a wasteful number, since it uses less digits than its factorization.

2105210811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3357626.

The product of its (nonzero) digits is 160, while the sum is 21.

The square root of 2105210811 is about 45882.5763335059. The cubic root of 2105210811 is about 1281.6374736208.

Adding to 2105210811 its reverse (1180125012), we get a palindrome (3285335823).

The spelling of 2105210811 in words is "two billion, one hundred five million, two hundred ten thousand, eight hundred eleven".