2106855473 has 2 divisors, whose sum is σ = 2106855474. Its totient is φ = 2106855472.

The previous prime is 2106855433. The next prime is 2106855529. The reversal of 2106855473 is 3745586012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1445748529 + 661106944 = 38023^2 + 25712^2 .

It is a cyclic number.

It is not a de Polignac number, because 2106855473 - 2¹² = 2106851377 is a prime.

It is a super-2 number, since 2×2106855473² = 8877679968220107458, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2106855473.

It is not a weakly prime, because it can be changed into another prime (2106855403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1053427736 + 1053427737.

It is an arithmetic number, because the mean of its divisors is an integer number (1053427737).

Almost surely, 2^2106855473 is an apocalyptic number.

It is an amenable number.

2106855473 is a deficient number, since it is larger than the sum of its proper divisors (1).

2106855473 is an equidigital number, since it uses as much as digits as its factorization.

2106855473 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 201600, while the sum is 41.

The square root of 2106855473 is about 45900.4953459110. The cubic root of 2106855473 is about 1281.9711396156.

The spelling of 2106855473 in words is "two billion, one hundred six million, eight hundred fifty-five thousand, four hundred seventy-three".