211997805696 has 96 divisors (see below), whose sum is σ = 610139275200. Its totient is φ = 70655104512.

The previous prime is 211997805689. The next prime is 211997805697. The reversal of 211997805696 is 696508799112.

It is a tau number, because it is divible by the number of its divisors (96).

It is not an unprimeable number, because it can be changed into a prime (211997805697) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11795565 + ... + 11813523.

It is an arithmetic number, because the mean of its divisors is an integer number (6355617450).

Almost surely, 2^211997805696 is an apocalyptic number.

It is an amenable number.

211997805696 is an abundant number, since it is smaller than the sum of its proper divisors (398141469504).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

211997805696 is a wasteful number, since it uses less digits than its factorization.

211997805696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28226 (or 28211 counting only the distinct ones).

The product of its (nonzero) digits is 14696640, while the sum is 63.

The spelling of 211997805696 in words is "two hundred eleven billion, nine hundred ninety-seven million, eight hundred five thousand, six hundred ninety-six".