2102841787 has 4 divisors (see below), whose sum is σ = 2103038856. Its totient is φ = 2102644720.

The previous prime is 2102841779. The next prime is 2102841791. The reversal of 2102841787 is 7871482012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2102841787 - 2³ = 2102841779 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2102841187) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81553 + ... + 104194.

It is an arithmetic number, because the mean of its divisors is an integer number (525759714).

Almost surely, 2^2102841787 is an apocalyptic number.

2102841787 is a deficient number, since it is larger than the sum of its proper divisors (197069).

2102841787 is a wasteful number, since it uses less digits than its factorization.

2102841787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197068.

The product of its (nonzero) digits is 50176, while the sum is 40.

The square root of 2102841787 is about 45856.7529051066. The cubic root of 2102841787 is about 1281.1565448170.

The spelling of 2102841787 in words is "two billion, one hundred two million, eight hundred forty-one thousand, seven hundred eighty-seven".