2100755865 has 16 divisors (see below), whose sum is σ = 3619764288. Its totient is φ = 1034218176.

The previous prime is 2100755861. The next prime is 2100755873. The reversal of 2100755865 is 5685570012.

It is not a de Polignac number, because 2100755865 - 2² = 2100755861 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (2100755861) 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, 5386359 + ... + 5386748.

It is an arithmetic number, because the mean of its divisors is an integer number (226235268).

Almost surely, 2^2100755865 is an apocalyptic number.

It is an amenable number.

2100755865 is a deficient number, since it is larger than the sum of its proper divisors (1519008423).

2100755865 is a wasteful number, since it uses less digits than its factorization.

2100755865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10773128.

The product of its (nonzero) digits is 84000, while the sum is 39.

The square root of 2100755865 is about 45834.0033708599. The cubic root of 2100755865 is about 1280.7327886162.

The spelling of 2100755865 in words is "two billion, one hundred million, seven hundred fifty-five thousand, eight hundred sixty-five".