321379821 has 48 divisors (see below), whose sum is σ = 554844160. Its totient is φ = 175387680.

The previous prime is 321379787. The next prime is 321379823. The reversal of 321379821 is 128973123.

It is not a de Polignac number, because 321379821 - 2¹⁰ = 321378797 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 (321379823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 153246 + ... + 155328.

Almost surely, 2^321379821 is an apocalyptic number.

321379821 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

321379821 is a deficient number, since it is larger than the sum of its proper divisors (233464339).

321379821 is a wasteful number, since it uses less digits than its factorization.

321379821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2206 (or 2203 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 321379821 is about 17927.0695039652. The cubic root of 321379821 is about 684.9720776442.

The spelling of 321379821 in words is "three hundred twenty-one million, three hundred seventy-nine thousand, eight hundred twenty-one".