211933985 has 8 divisors (see below), whose sum is σ = 269280936. Its totient is φ = 159573760.

The previous prime is 211933957. The next prime is 211933991. The reversal of 211933985 is 589339112.

It can be written as a sum of positive squares in 4 ways, for example, as 120846049 + 91087936 = 10993^2 + 9544^2 .

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

It is not a de Polignac number, because 211933985 - 2⁶ = 211933921 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1246586 + ... + 1246755.

It is an arithmetic number, because the mean of its divisors is an integer number (33660117).

Almost surely, 2^211933985 is an apocalyptic number.

It is an amenable number.

211933985 is a deficient number, since it is larger than the sum of its proper divisors (57346951).

211933985 is a wasteful number, since it uses less digits than its factorization.

211933985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2493363.

The product of its digits is 58320, while the sum is 41.

The square root of 211933985 is about 14557.9526376479. The cubic root of 211933985 is about 596.2112978789.

The spelling of 211933985 in words is "two hundred eleven million, nine hundred thirty-three thousand, nine hundred eighty-five".