1231231201212 has 24 divisors (see below), whose sum is σ = 2873232450256. Its totient is φ = 410359022208.

The previous prime is 1231231201183. The next prime is 1231231201237. The reversal of 1231231201212 is 2121021321321.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 6322363 + ... + 6514194.

Almost surely, 2^{1231231201212} is an apocalyptic number.

1231231201212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1231231201212 is an abundant number, since it is smaller than the sum of its proper divisors (1642001249044).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1231231201212 is a wasteful number, since it uses less digits than its factorization.

1231231201212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12844557 (or 12844555 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 1231231201212 its reverse (2121021321321), we get a palindrome (3352252522533).

The spelling of 1231231201212 in words is "one trillion, two hundred thirty-one billion, two hundred thirty-one million, two hundred one thousand, two hundred twelve".