It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1228187231 = 11483 ⋅106957.
It is a cyclic number.
It is a Duffinian number.
It is a congruent number.
Almost surely, 21327818221 is an apocalyptic number.
It is an amenable number.
1327818221 is an equidigital number, since it uses as much as digits as its factorization.
1327818221 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 57731250.
The square root of 1327818221 is about 36439.2401265449. The cubic root of 1327818221 is about 1099.1227774824.
The spelling of 1327818221 in words is "one billion, three hundred twenty-seven million, eight hundred eighteen thousand, two hundred twenty-one".