11231312211 has 48 divisors (see below), whose sum is σ = 18962012160. Its totient is φ = 6273633600.

The previous prime is 11231312207. The next prime is 11231312227. The reversal of 11231312211 is 11221313211.

11231312211 is a `hidden beast` number, since 112 + 31 + 312 + 211 = 666.

11231312211 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 11231312211 - 2² = 11231312207 is a prime.

It is a super-2 number, since 2×11231312211² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11231312291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 491506 + ... + 513848.

It is an arithmetic number, because the mean of its divisors is an integer number (395041920).

Almost surely, 2^11231312211 is an apocalyptic number.

11231312211 is a deficient number, since it is larger than the sum of its proper divisors (7730699949).

11231312211 is a wasteful number, since it uses less digits than its factorization.

11231312211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22536 (or 22533 counting only the distinct ones).

The product of its digits is 72, while the sum is 18.

Adding to 11231312211 its reverse (11221313211), we get a palindrome (22452625422).

The spelling of 11231312211 in words is "eleven billion, two hundred thirty-one million, three hundred twelve thousand, two hundred eleven".