Adding to 31212013200000 its reverse (231021213), we get a palindrome (31212244221213).
It is a tau number, because it is divible by the number of its divisors (192).
It is an unprimeable number.
Almost surely, 231212013200000 is an apocalyptic number.
31212013200000 is a gapful number since it is divisible by the number (30) formed by its first and last digit.
It is an amenable number.
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
31212013200000 is an frugal number, since it uses more digits than its factorization.
31212013200000 is an evil number, because the sum of its binary digits is even.
The spelling of 31212013200000 in words is "thirty-one trillion, two hundred twelve billion, thirteen million, two hundred thousand".