211081311 has 24 divisors (see below), whose sum is σ = 348869664. Its totient is φ = 120473280.

The previous prime is 211081307. The next prime is 211081313. The reversal of 211081311 is 113180112.

It is a happy number.

It is not a de Polignac number, because 211081311 - 2² = 211081307 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211081313) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 72985 + ... + 75821.

It is an arithmetic number, because the mean of its divisors is an integer number (14536236).

Almost surely, 2^211081311 is an apocalyptic number.

211081311 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

211081311 is a deficient number, since it is larger than the sum of its proper divisors (137788353).

211081311 is a wasteful number, since it uses less digits than its factorization.

211081311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4031 (or 4028 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

The square root of 211081311 is about 14528.6376167898. The cubic root of 211081311 is about 595.4106441905.

The spelling of 211081311 in words is "two hundred eleven million, eighty-one thousand, three hundred eleven".