2100726863817 has 32 divisors (see below), whose sum is σ = 2910438604800. Its totient is φ = 1346191844928.

The previous prime is 2100726863791. The next prime is 2100726863819. The reversal of 2100726863817 is 7183686270012.

It is not a de Polignac number, because 2100726863817 - 2¹¹ = 2100726861769 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2100726863817.

It is not an unprimeable number, because it can be changed into a prime (2100726863819) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18903028 + ... + 19013834.

It is an arithmetic number, because the mean of its divisors is an integer number (90951206400).

Almost surely, 2^{2100726863817} is an apocalyptic number.

It is an amenable number.

2100726863817 is a deficient number, since it is larger than the sum of its proper divisors (809711740983).

2100726863817 is a wasteful number, since it uses less digits than its factorization.

2100726863817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111805.

The product of its (nonzero) digits is 1354752, while the sum is 51.

The spelling of 2100726863817 in words is "two trillion, one hundred billion, seven hundred twenty-six million, eight hundred sixty-three thousand, eight hundred seventeen".