211689009856 has 14 divisors (see below), whose sum is σ = 420070379060. Its totient is φ = 105844504896.

The previous prime is 211689009853. The next prime is 211689009871. The reversal of 211689009856 is 658900986112.

It is a junction number, because it is equal to n+sod(n) for n = 211689009797 and 211689009806.

It is not an unprimeable number, because it can be changed into a prime (211689009853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1653820326 + ... + 1653820453.

Almost surely, 2^211689009856 is an apocalyptic number.

It is an amenable number.

211689009856 is a deficient number, since it is larger than the sum of its proper divisors (208381369204).

211689009856 is an equidigital number, since it uses as much as digits as its factorization.

211689009856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3307640791 (or 3307640781 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 55.

The spelling of 211689009856 in words is "two hundred eleven billion, six hundred eighty-nine million, nine thousand, eight hundred fifty-six".