211000209985 has 8 divisors (see below), whose sum is σ = 259375868136. Its totient is φ = 164683090560.

The previous prime is 211000209947. The next prime is 211000209991. The reversal of 211000209985 is 589902000112.

It can be written as a sum of positive squares in 4 ways, for example, as 70358544 + 210929851441 = 8388^2 + 459271^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 211000209985 - 2¹¹ = 211000207937 is a prime.

It is a super-2 number, since 2×211000209985² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 514634454 + ... + 514634863.

It is an arithmetic number, because the mean of its divisors is an integer number (32421983517).

Almost surely, 2^211000209985 is an apocalyptic number.

It is an amenable number.

211000209985 is a deficient number, since it is larger than the sum of its proper divisors (48375658151).

211000209985 is a wasteful number, since it uses less digits than its factorization.

211000209985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1029269363.

The product of its (nonzero) digits is 12960, while the sum is 37.

The spelling of 211000209985 in words is "two hundred eleven billion, two hundred nine thousand, nine hundred eighty-five".