12145233231 has 20 divisors (see below), whose sum is σ = 18191564952. Its totient is φ = 8075094768.

The previous prime is 12145233229. The next prime is 12145233253. The reversal of 12145233231 is 13233254121.

It is not a de Polignac number, because 12145233231 - 2¹ = 12145233229 is a prime.

It is a super-2 number, since 2×12145233231² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 12145233195 and 12145233204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12145233431) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 170781 + ... + 231206.

Almost surely, 2^12145233231 is an apocalyptic number.

12145233231 is a deficient number, since it is larger than the sum of its proper divisors (6046331721).

12145233231 is an equidigital number, since it uses as much as digits as its factorization.

12145233231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402372 (or 402363 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

Adding to 12145233231 its reverse (13233254121), we get a palindrome (25378487352).

The spelling of 12145233231 in words is "twelve billion, one hundred forty-five million, two hundred thirty-three thousand, two hundred thirty-one".