Adding to 12132321 its reverse (12323121), we get a palindrome (24455442).
It is a sphenic number, since it is the product of 3 distinct primes.
It is a self number, because there is not a number n which added to its sum of digits gives 12132321.
Almost surely, 212132321 is an apocalyptic number.
It is an amenable number.
12132321 is an equidigital number, since it uses as much as digits as its factorization.
12132321 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 94095.
The square root of 12132321 is about 3483.1481449976. The cubic root of 12132321 is about 229.7812728405.
The spelling of 12132321 in words is "twelve million, one hundred thirty-two thousand, three hundred twenty-one".