2106856771 has 2 divisors, whose sum is σ = 2106856772. Its totient is φ = 2106856770.

The previous prime is 2106856747. The next prime is 2106856837. The reversal of 2106856771 is 1776586012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2106856771 - 2²¹ = 2104759619 is a prime.

It is not a weakly prime, because it can be changed into another prime (2106851771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1053428385 + 1053428386.

It is an arithmetic number, because the mean of its divisors is an integer number (1053428386).

Almost surely, 2^2106856771 is an apocalyptic number.

2106856771 is a deficient number, since it is larger than the sum of its proper divisors (1).

2106856771 is an equidigital number, since it uses as much as digits as its factorization.

2106856771 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 141120, while the sum is 43.

The square root of 2106856771 is about 45900.5094851898. The cubic root of 2106856771 is about 1281.9714028828.

The spelling of 2106856771 in words is "two billion, one hundred six million, eight hundred fifty-six thousand, seven hundred seventy-one".