11231221311 has 12 divisors (see below), whose sum is σ = 16383499080. Its totient is φ = 7413346800.

The previous prime is 11231221303. The next prime is 11231221319. The reversal of 11231221311 is 11312213211.

It is an interprime number because it is at equal distance from previous prime (11231221303) and next prime (11231221319).

It is not a de Polignac number, because 11231221311 - 2³ = 11231221303 is a prime.

It is a super-2 number, since 2×11231221311² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11231221319) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6176881 + ... + 6178698.

It is an arithmetic number, because the mean of its divisors is an integer number (1365291590).

Almost surely, 2^11231221311 is an apocalyptic number.

11231221311 is a deficient number, since it is larger than the sum of its proper divisors (5152277769).

11231221311 is a wasteful number, since it uses less digits than its factorization.

11231221311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12355686 (or 12355683 counting only the distinct ones).

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

Adding to 11231221311 its reverse (11312213211), we get a palindrome (22543434522).

The spelling of 11231221311 in words is "eleven billion, two hundred thirty-one million, two hundred twenty-one thousand, three hundred eleven".