11231212133 has 16 divisors (see below), whose sum is σ = 12289777920. Its totient is φ = 10230321024.

The previous prime is 11231212127. The next prime is 11231212159. The reversal of 11231212133 is 33121213211.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 11231212133 - 2¹⁴ = 11231195749 is a prime.

It is a super-2 number, since 2×11231212133² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11231212193) 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 15 ways as a sum of consecutive naturals, for example, 66641 + ... + 164022.

It is an arithmetic number, because the mean of its divisors is an integer number (768111120).

Almost surely, 2^11231212133 is an apocalyptic number.

It is an amenable number.

11231212133 is a deficient number, since it is larger than the sum of its proper divisors (1058565787).

11231212133 is a wasteful number, since it uses less digits than its factorization.

11231212133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230788.

The product of its digits is 216, while the sum is 20.

Adding to 11231212133 its reverse (33121213211), we get a palindrome (44352425344).

The spelling of 11231212133 in words is "eleven billion, two hundred thirty-one million, two hundred twelve thousand, one hundred thirty-three".