21231031312112 has 10 divisors (see below), whose sum is σ = 41135123167248. Its totient is φ = 10615515656048.

The previous prime is 21231031312111. The next prime is 21231031312157. The reversal of 21231031312112 is 21121313013212.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21231031312111) 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 as a sum of consecutive naturals, namely, 663469728488 + ... + 663469728519.

Almost surely, 2^{21231031312112} is an apocalyptic number.

It is an amenable number.

21231031312112 is a deficient number, since it is larger than the sum of its proper divisors (19904091855136).

21231031312112 is a wasteful number, since it uses less digits than its factorization.

21231031312112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1326939457015 (or 1326939457009 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 23.

Adding to 21231031312112 its reverse (21121313013212), we get a palindrome (42352344325324).

The spelling of 21231031312112 in words is "twenty-one trillion, two hundred thirty-one billion, thirty-one million, three hundred twelve thousand, one hundred twelve".