210530605905 has 12 divisors (see below), whose sum is σ = 364919716980. Its totient is φ = 112282989792.

The previous prime is 210530605853. The next prime is 210530605921. The reversal of 210530605905 is 509506035012.

210530605905 is a `hidden beast` number, since 2 + 1 + 0 + 5 + 3 + 0 + 60 + 590 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 164148953409 + 46381652496 = 405153^2 + 215364^2 .

It is not a de Polignac number, because 210530605905 - 2⁶ = 210530605841 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 210530605905.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2339228910 + ... + 2339228999.

It is an arithmetic number, because the mean of its divisors is an integer number (30409976415).

Almost surely, 2^210530605905 is an apocalyptic number.

It is an amenable number.

210530605905 is a deficient number, since it is larger than the sum of its proper divisors (154389111075).

210530605905 is a wasteful number, since it uses less digits than its factorization.

210530605905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4678457920 (or 4678457917 counting only the distinct ones).

The product of its (nonzero) digits is 40500, while the sum is 36.

The spelling of 210530605905 in words is "two hundred ten billion, five hundred thirty million, six hundred five thousand, nine hundred five".