11231031211 has 4 divisors (see below), whose sum is σ = 11231287000. Its totient is φ = 11230775424.

The previous prime is 11231031209. The next prime is 11231031221. The reversal of 11231031211 is 11213013211.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11231031211 - 2¹ = 11231031209 is a prime.

It is a super-3 number, since 3×11231031211³ (a number of 31 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11231031221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43446 + ... + 156043.

It is an arithmetic number, because the mean of its divisors is an integer number (2807821750).

Almost surely, 2^11231031211 is an apocalyptic number.

11231031211 is a deficient number, since it is larger than the sum of its proper divisors (255789).

11231031211 is an equidigital number, since it uses as much as digits as its factorization.

11231031211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255788.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 11231031211 its reverse (11213013211), we get a palindrome (22444044422).

The spelling of 11231031211 in words is "eleven billion, two hundred thirty-one million, thirty-one thousand, two hundred eleven".