12121230231 has 32 divisors (see below), whose sum is σ = 20742220800. Its totient is φ = 6914067840.

The previous prime is 12121230227. The next prime is 12121230259. The reversal of 12121230231 is 13203212121.

12121230231 is a `hidden beast` number, since 121 + 212 + 302 + 31 = 666.

It is not a de Polignac number, because 12121230231 - 2² = 12121230227 is a prime.

It is a super-2 number, since 2×12121230231² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121230211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1195311 + ... + 1205408.

It is an arithmetic number, because the mean of its divisors is an integer number (648194400).

Almost surely, 2^12121230231 is an apocalyptic number.

12121230231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12121230231 is a deficient number, since it is larger than the sum of its proper divisors (8620990569).

12121230231 is a wasteful number, since it uses less digits than its factorization.

12121230231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2400756 (or 2400750 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 12121230231 its reverse (13203212121), we get a palindrome (25324442352).

The spelling of 12121230231 in words is "twelve billion, one hundred twenty-one million, two hundred thirty thousand, two hundred thirty-one".