1327818221 has 4 divisors (see below), whose sum is σ = 1385549472. Its totient is φ = 1270086972.

The previous prime is 1327818209. The next prime is 1327818253. The reversal of 1327818221 is 1228187231.

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 not a de Polignac number, because 1327818221 - 2¹⁴ = 1327801837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1327818281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28865591 + ... + 28865636.

It is an arithmetic number, because the mean of its divisors is an integer number (346387368).

Almost surely, 2^1327818221 is an apocalyptic number.

It is an amenable number.

1327818221 is a deficient number, since it is larger than the sum of its proper divisors (57731251).

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 product of its digits is 10752, while the sum is 35.

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".