2117842811 has 4 divisors (see below), whose sum is σ = 2420391792. Its totient is φ = 1815293832.

The previous prime is 2117842801. The next prime is 2117842849. The reversal of 2117842811 is 1182487112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2117842811 - 2¹⁴ = 2117826427 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2117842801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151274480 + ... + 151274493.

It is an arithmetic number, because the mean of its divisors is an integer number (605097948).

Almost surely, 2^2117842811 is an apocalyptic number.

2117842811 is a deficient number, since it is larger than the sum of its proper divisors (302548981).

2117842811 is an equidigital number, since it uses as much as digits as its factorization.

2117842811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302548980.

The product of its digits is 7168, while the sum is 35.

The square root of 2117842811 is about 46020.0261951251. The cubic root of 2117842811 is about 1284.1957876263.

The spelling of 2117842811 in words is "two billion, one hundred seventeen million, eight hundred forty-two thousand, eight hundred eleven".