211040305 has 24 divisors (see below), whose sum is σ = 297490752. Its totient is φ = 143291232.

The previous prime is 211040251. The next prime is 211040317. The reversal of 211040305 is 503040112.

It is not a de Polignac number, because 211040305 - 2⁹ = 211039793 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21054 + ... + 29416.

It is an arithmetic number, because the mean of its divisors is an integer number (12395448).

Almost surely, 2^211040305 is an apocalyptic number.

It is an amenable number.

211040305 is a deficient number, since it is larger than the sum of its proper divisors (86450447).

211040305 is a wasteful number, since it uses less digits than its factorization.

211040305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8485 (or 8478 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 211040305 is about 14527.2263354021. The cubic root of 211040305 is about 595.3720856054.

Adding to 211040305 its reverse (503040112), we get a palindrome (714080417).

The spelling of 211040305 in words is "two hundred eleven million, forty thousand, three hundred five".