2101865278 has 16 divisors (see below), whose sum is σ = 3342813840. Its totient is φ = 987762816.

The previous prime is 2101865251. The next prime is 2101865303. The reversal of 2101865278 is 8725681012.

It is a self number, because there is not a number n which added to its sum of digits gives 2101865278.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16701 + ... + 66952.

It is an arithmetic number, because the mean of its divisors is an integer number (208925865).

Almost surely, 2^2101865278 is an apocalyptic number.

2101865278 is a deficient number, since it is larger than the sum of its proper divisors (1240948562).

2101865278 is a wasteful number, since it uses less digits than its factorization.

2101865278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84411.

The product of its (nonzero) digits is 53760, while the sum is 40.

The square root of 2101865278 is about 45846.1042837884. The cubic root of 2101865278 is about 1280.9582013803.

The spelling of 2101865278 in words is "two billion, one hundred one million, eight hundred sixty-five thousand, two hundred seventy-eight".