11133213231 has 16 divisors (see below), whose sum is σ = 17284990464. Its totient is φ = 6241800864.

The previous prime is 11133213209. The next prime is 11133213263. The reversal of 11133213231 is 13231233111.

It is a happy number.

It is not a de Polignac number, because 11133213231 - 2⁵ = 11133213199 is a prime.

It is a super-2 number, since 2×11133213231² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 11133213198 and 11133213207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11133213631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5000331 + ... + 5002556.

It is an arithmetic number, because the mean of its divisors is an integer number (1080311904).

Almost surely, 2^11133213231 is an apocalyptic number.

11133213231 is a deficient number, since it is larger than the sum of its proper divisors (6151777233).

11133213231 is a wasteful number, since it uses less digits than its factorization.

11133213231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10002950.

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

Adding to 11133213231 its reverse (13231233111), we get a palindrome (24364446342).

The spelling of 11133213231 in words is "eleven billion, one hundred thirty-three million, two hundred thirteen thousand, two hundred thirty-one".