210806408805 has 32 divisors (see below), whose sum is σ = 352129849344. Its totient is φ = 107488408896.

The previous prime is 210806408803. The next prime is 210806408821. The reversal of 210806408805 is 508804608012.

It is not a de Polignac number, because 210806408805 - 2¹ = 210806408803 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210806408803) 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, 548592 + ... + 850038.

It is an arithmetic number, because the mean of its divisors is an integer number (11004057792).

Almost surely, 2^210806408805 is an apocalyptic number.

It is an amenable number.

210806408805 is a deficient number, since it is larger than the sum of its proper divisors (141323440539).

210806408805 is a wasteful number, since it uses less digits than its factorization.

210806408805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303505.

The product of its (nonzero) digits is 122880, while the sum is 42.

The spelling of 210806408805 in words is "two hundred ten billion, eight hundred six million, four hundred eight thousand, eight hundred five".