12121224231 has 8 divisors (see below), whose sum is σ = 16165006704. Its totient is φ = 8079128960.

The previous prime is 12121224187. The next prime is 12121224239. The reversal of 12121224231 is 13242212121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12121224231 is a prime.

It is a super-2 number, since 2×12121224231² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12121224198 and 12121224207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121224239) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 404940 + ... + 433841.

It is an arithmetic number, because the mean of its divisors is an integer number (2020625838).

Almost surely, 2^12121224231 is an apocalyptic number.

12121224231 is a deficient number, since it is larger than the sum of its proper divisors (4043782473).

12121224231 is an equidigital number, since it uses as much as digits as its factorization.

12121224231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 843601.

The product of its digits is 384, while the sum is 21.

Adding to 12121224231 its reverse (13242212121), we get a palindrome (25363436352).

The spelling of 12121224231 in words is "twelve billion, one hundred twenty-one million, two hundred twenty-four thousand, two hundred thirty-one".