211955862806 has 4 divisors (see below), whose sum is σ = 317933794212. Its totient is φ = 105977931402.

The previous prime is 211955862803. The next prime is 211955862857. The reversal of 211955862806 is 608268559112.

211955862806 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211955862803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52988965700 + ... + 52988965703.

It is an arithmetic number, because the mean of its divisors is an integer number (79483448553).

Almost surely, 2^211955862806 is an apocalyptic number.

211955862806 is a deficient number, since it is larger than the sum of its proper divisors (105977931406).

211955862806 is a wasteful number, since it uses less digits than its factorization.

211955862806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105977931405.

The product of its (nonzero) digits is 2073600, while the sum is 53.

The spelling of 211955862806 in words is "two hundred eleven billion, nine hundred fifty-five million, eight hundred sixty-two thousand, eight hundred six".