211161808870 has 16 divisors (see below), whose sum is σ = 380196231840. Its totient is φ = 84441395584.

The previous prime is 211161808849. The next prime is 211161808873. The reversal of 211161808870 is 78808161112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211161808873) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2877955 + ... + 2950414.

It is an arithmetic number, because the mean of its divisors is an integer number (23762264490).

Almost surely, 2^211161808870 is an apocalyptic number.

211161808870 is a deficient number, since it is larger than the sum of its proper divisors (169034422970).

211161808870 is a wasteful number, since it uses less digits than its factorization.

211161808870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5831999.

The product of its (nonzero) digits is 43008, while the sum is 43.

Adding to 211161808870 its reverse (78808161112), we get a palindrome (289969969982).

The spelling of 211161808870 in words is "two hundred eleven billion, one hundred sixty-one million, eight hundred eight thousand, eight hundred seventy".