1327378821 has 4 divisors (see below), whose sum is σ = 1769838432. Its totient is φ = 884919212.

The previous prime is 1327378781. The next prime is 1327378837. The reversal of 1327378821 is 1288737231.

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.

It is a cyclic number.

It is not a de Polignac number, because 1327378821 - 2¹⁰ = 1327377797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1327378861) 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, 221229801 + ... + 221229806.

It is an arithmetic number, because the mean of its divisors is an integer number (442459608).

Almost surely, 2^1327378821 is an apocalyptic number.

It is an amenable number.

1327378821 is a deficient number, since it is larger than the sum of its proper divisors (442459611).

1327378821 is an equidigital number, since it uses as much as digits as its factorization.

1327378821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442459610.

The product of its digits is 112896, while the sum is 42.

The square root of 1327378821 is about 36433.2104130284. The cubic root of 1327378821 is about 1099.0015239796.

The spelling of 1327378821 in words is "one billion, three hundred twenty-seven million, three hundred seventy-eight thousand, eight hundred twenty-one".