Adding to 133231212 its reverse (212132331), we get a palindrome (345363543).
It is a tau number, because it is divible by the number of its divisors (18).
It is a nude number because it is divisible by every one of its digits.
It is an unprimeable number.
Almost surely, 2133231212 is an apocalyptic number.
133231212 is a gapful number since it is divisible by the number (12) 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.
133231212 is a wasteful number, since it uses less digits than its factorization.
133231212 is an evil number, because the sum of its binary digits is even.
The square root of 133231212 is about 11542.5825533110. The cubic root of 133231212 is about 510.7424940480.
The spelling of 133231212 in words is "one hundred thirty-three million, two hundred thirty-one thousand, two hundred twelve".