1212131221231 has 24 divisors (see below), whose sum is σ = 1481319934976. Its totient is φ = 971377660800.

The previous prime is 1212131221187. The next prime is 1212131221261. The reversal of 1212131221231 is 1321221312121.

It is a happy number.

It is not a de Polignac number, because 1212131221231 - 2¹⁹ = 1212130696943 is a prime.

It is a super-4 number, since 4×1212131221231⁴ (a number of 49 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212131221261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1678551 + ... + 2289496.

Almost surely, 2^{1212131221231} is an apocalyptic number.

1212131221231 is a deficient number, since it is larger than the sum of its proper divisors (269188713745).

1212131221231 is a wasteful number, since it uses less digits than its factorization.

1212131221231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3968239 (or 3968222 counting only the distinct ones).

The product of its digits is 288, while the sum is 22.

Adding to 1212131221231 its reverse (1321221312121), we get a palindrome (2533352533352).

The spelling of 1212131221231 in words is "one trillion, two hundred twelve billion, one hundred thirty-one million, two hundred twenty-one thousand, two hundred thirty-one".