11311031211 has 32 divisors (see below), whose sum is σ = 15781009920. Its totient is φ = 7197120000.

The previous prime is 11311031203. The next prime is 11311031257. The reversal of 11311031211 is 11213011311.

It is not a de Polignac number, because 11311031211 - 2³ = 11311031203 is a prime.

It is a super-2 number, since 2×11311031211² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11311032211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9417411 + ... + 9418611.

It is an arithmetic number, because the mean of its divisors is an integer number (493156560).

Almost surely, 2^11311031211 is an apocalyptic number.

11311031211 is a deficient number, since it is larger than the sum of its proper divisors (4469978709).

11311031211 is a wasteful number, since it uses less digits than its factorization.

11311031211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2387.

The product of its (nonzero) digits is 18, while the sum is 15.

Adding to 11311031211 its reverse (11213011311), we get a palindrome (22524042522).

The spelling of 11311031211 in words is "eleven billion, three hundred eleven million, thirty-one thousand, two hundred eleven".