321820379 has 4 divisors (see below), whose sum is σ = 321863040. Its totient is φ = 321777720.

The previous prime is 321820361. The next prime is 321820381. The reversal of 321820379 is 973028123.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 321820379 - 2¹² = 321816283 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (321820349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6644 + ... + 26225.

It is an arithmetic number, because the mean of its divisors is an integer number (80465760).

Almost surely, 2^321820379 is an apocalyptic number.

321820379 is a deficient number, since it is larger than the sum of its proper divisors (42661).

321820379 is an equidigital number, since it uses as much as digits as its factorization.

321820379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42660.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 321820379 is about 17939.3528032647. The cubic root of 321820379 is about 685.2849287960.

The spelling of 321820379 in words is "three hundred twenty-one million, eight hundred twenty thousand, three hundred seventy-nine".