12133231 has 16 divisors (see below), whose sum is σ = 13650048. Its totient is φ = 10692000.

The previous prime is 12133217. The next prime is 12133241. The reversal of 12133231 is 13233121.

It is not a de Polignac number, because 12133231 - 2⁹ = 12132719 is a prime.

It is a super-2 number, since 2×12133231² = 294430588998722, which 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 (12133241) 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, 74356 + ... + 74518.

It is an arithmetic number, because the mean of its divisors is an integer number (853128).

Almost surely, 2^12133231 is an apocalyptic number.

12133231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12133231 is a deficient number, since it is larger than the sum of its proper divisors (1516817).

12133231 is a wasteful number, since it uses less digits than its factorization.

12133231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342.

The product of its digits is 108, while the sum is 16.

The square root of 12133231 is about 3483.2787715025. The cubic root of 12133231 is about 229.7870177080.

Adding to 12133231 its reverse (13233121), we get a palindrome (25366352).

It can be divided in two parts, 1213 and 3231, that added together give a palindrome (4444).

The spelling of 12133231 in words is "twelve million, one hundred thirty-three thousand, two hundred thirty-one".