11211213231 has 24 divisors (see below), whose sum is σ = 16637512944. Its totient is φ = 7269575040.

The previous prime is 11211213179. The next prime is 11211213257. The reversal of 11211213231 is 13231211211.

11211213231 is a `hidden beast` number, since 11 + 211 + 213 + 231 = 666.

It is not a de Polignac number, because 11211213231 - 2¹¹ = 11211211183 is a prime.

It is a super-2 number, since 2×11211213231² (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 (11211213281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1558515 + ... + 1565691.

It is an arithmetic number, because the mean of its divisors is an integer number (693229706).

Almost surely, 2^11211213231 is an apocalyptic number.

11211213231 is a deficient number, since it is larger than the sum of its proper divisors (5426299713).

11211213231 is a wasteful number, since it uses less digits than its factorization.

11211213231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11911 (or 11908 counting only the distinct ones).

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

Adding to 11211213231 its reverse (13231211211), we get a palindrome (24442424442).

The spelling of 11211213231 in words is "eleven billion, two hundred eleven million, two hundred thirteen thousand, two hundred thirty-one".