231220321021212 has 12 divisors (see below), whose sum is σ = 539514082382856. Its totient is φ = 77073440340400.

The previous prime is 231220321021211. The next prime is 231220321021219. The reversal of 231220321021212 is 212120123022132.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231220321021211) 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 3 ways as a sum of consecutive naturals, for example, 9634180042539 + ... + 9634180042562.

It is an arithmetic number, because the mean of its divisors is an integer number (44959506865238).

Almost surely, 2^{231220321021212} is an apocalyptic number.

It is an amenable number.

231220321021212 is an abundant number, since it is smaller than the sum of its proper divisors (308293761361644).

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

231220321021212 is a wasteful number, since it uses less digits than its factorization.

231220321021212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19268360085108 (or 19268360085106 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 231220321021212 its reverse (212120123022132), we get a palindrome (443340444043344).

The spelling of 231220321021212 in words is "two hundred thirty-one trillion, two hundred twenty billion, three hundred twenty-one million, twenty-one thousand, two hundred twelve".