2100686578 has 16 divisors (see below), whose sum is σ = 3229742880. Its totient is φ = 1024135200.

The previous prime is 2100686561. The next prime is 2100686579. The reversal of 2100686578 is 8756860012.

It is not an unprimeable number, because it can be changed into a prime (2100686579) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 158533 + ... + 171271.

It is an arithmetic number, because the mean of its divisors is an integer number (201858930).

Almost surely, 2^2100686578 is an apocalyptic number.

2100686578 is a deficient number, since it is larger than the sum of its proper divisors (1129056302).

2100686578 is a wasteful number, since it uses less digits than its factorization.

2100686578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14793.

The product of its (nonzero) digits is 161280, while the sum is 43.

The square root of 2100686578 is about 45833.2475174954. The cubic root of 2100686578 is about 1280.7187081116.

It can be divided in two parts, 21006 and 86578, that added together give a square (107584 = 328²).

The spelling of 2100686578 in words is "two billion, one hundred million, six hundred eighty-six thousand, five hundred seventy-eight".