2100859605 has 64 divisors (see below), whose sum is σ = 4030467840. Its totient is φ = 1032134400.

The previous prime is 2100859601. The next prime is 2100859661. The reversal of 2100859605 is 5069580012.

It is a happy number.

It is not a de Polignac number, because 2100859605 - 2² = 2100859601 is a prime.

It is a super-2 number, since 2×2100859605² = 8827222159841512050, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2100859605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100859601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1159150 + ... + 1160960.

It is an arithmetic number, because the mean of its divisors is an integer number (62976060).

Almost surely, 2^2100859605 is an apocalyptic number.

It is an amenable number.

2100859605 is a deficient number, since it is larger than the sum of its proper divisors (1929608235).

2100859605 is a wasteful number, since it uses less digits than its factorization.

2100859605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2499 (or 2493 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

The square root of 2100859605 is about 45835.1350494356. The cubic root of 2100859605 is about 1280.7538700811.

The spelling of 2100859605 in words is "two billion, one hundred million, eight hundred fifty-nine thousand, six hundred five".