11331213231 has 12 divisors (see below), whose sum is σ = 16359858888. Its totient is φ = 6973053984.

The previous prime is 11331213209. The next prime is 11331213233. The reversal of 11331213231 is 13231213311.

It is a happy number.

It is not a de Polignac number, because 11331213231 - 2⁹ = 11331212719 is a prime.

It is a super-2 number, since 2×11331213231² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11331213198 and 11331213207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11331213233) 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 11 ways as a sum of consecutive naturals, for example, 11174260 + ... + 11175273.

It is an arithmetic number, because the mean of its divisors is an integer number (1363321574).

Almost surely, 2^11331213231 is an apocalyptic number.

11331213231 is a deficient number, since it is larger than the sum of its proper divisors (5028645657).

11331213231 is a wasteful number, since it uses less digits than its factorization.

11331213231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22349562 (or 22349549 counting only the distinct ones).

The product of its digits is 324, while the sum is 21.

Adding to 11331213231 its reverse (13231213311), we get a palindrome (24562426542).

The spelling of 11331213231 in words is "eleven billion, three hundred thirty-one million, two hundred thirteen thousand, two hundred thirty-one".