11213113231 has 4 divisors (see below), whose sum is σ = 11321978512. Its totient is φ = 11104247952.

The previous prime is 11213113229. The next prime is 11213113267. The reversal of 11213113231 is 13231131211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13231131211 = 51551 ⋅256661.

It is a cyclic number.

It is not a de Polignac number, because 11213113231 - 2¹ = 11213113229 is a prime.

It is a super-2 number, since 2×11213113231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11213113199 and 11213113208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11213113211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54432486 + ... + 54432691.

It is an arithmetic number, because the mean of its divisors is an integer number (2830494628).

Almost surely, 2^11213113231 is an apocalyptic number.

11213113231 is a deficient number, since it is larger than the sum of its proper divisors (108865281).

11213113231 is a wasteful number, since it uses less digits than its factorization.

11213113231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108865280.

The product of its digits is 108, while the sum is 19.

Adding to 11213113231 its reverse (13231131211), we get a palindrome (24444244442).

The spelling of 11213113231 in words is "eleven billion, two hundred thirteen million, one hundred thirteen thousand, two hundred thirty-one".