2101855716 has 81 divisors (see below), whose sum is σ = 5536654851. Its totient is φ = 698142888.

The previous prime is 2101855703. The next prime is 2101855733. The reversal of 2101855716 is 6175581012.

The square root of 2101855716 is 45846.

It is a perfect power (a square), and thus also a powerful number.

2101855716 is a `hidden beast` number, since 2 + 1 + 0 + 1 + 85 + 571 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (81).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 7426911 + ... + 7427193.

Almost surely, 2^2101855716 is an apocalyptic number.

2101855716 is the 45846-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2101855716

2101855716 is an abundant number, since it is smaller than the sum of its proper divisors (3434799135).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2101855716 is an frugal number, since it uses more digits than its factorization.

2101855716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 594 (or 288 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 36.

The cubic root of 2101855716 is about 1280.9562588929.

Multiplying 2101855716 by its sum of digits (36), we get a square (75666805776 = 275076²).

2101855716 divided by its sum of digits (36) gives a square (58384881 = 7641²).

The spelling of 2101855716 in words is "two billion, one hundred one million, eight hundred fifty-five thousand, seven hundred sixteen".