211231120209 has 32 divisors (see below), whose sum is σ = 285951344640. Its totient is φ = 138684353472.

The previous prime is 211231120151. The next prime is 211231120211. The reversal of 211231120209 is 902021132112.

211231120209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 211231120209 - 2¹³ = 211231112017 is a prime.

It is a super-2 number, since 2×211231120209² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (211231120249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 68870694 + ... + 68873760.

It is an arithmetic number, because the mean of its divisors is an integer number (8935979520).

Almost surely, 2^211231120209 is an apocalyptic number.

It is an amenable number.

211231120209 is a deficient number, since it is larger than the sum of its proper divisors (74720224431).

211231120209 is a wasteful number, since it uses less digits than its factorization.

211231120209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4469.

The product of its (nonzero) digits is 432, while the sum is 24.

The spelling of 211231120209 in words is "two hundred eleven billion, two hundred thirty-one million, one hundred twenty thousand, two hundred nine".