321541321 has 4 divisors (see below), whose sum is σ = 326070144. Its totient is φ = 317012500.

The previous prime is 321541307. The next prime is 321541343. The reversal of 321541321 is 123145123.

It is a happy number.

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 321541321 - 2⁵ = 321541289 is a prime.

It is a super-2 number, since 2×321541321² = 206777642220850082, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 321541292 and 321541301.

It is not an unprimeable number, because it can be changed into a prime (321545321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2264305 + ... + 2264446.

It is an arithmetic number, because the mean of its divisors is an integer number (81517536).

Almost surely, 2^321541321 is an apocalyptic number.

It is an amenable number.

321541321 is a deficient number, since it is larger than the sum of its proper divisors (4528823).

321541321 is an equidigital number, since it uses as much as digits as its factorization.

321541321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4528822.

The product of its digits is 720, while the sum is 22.

The square root of 321541321 is about 17931.5732996299. The cubic root of 321541321 is about 685.0867959706.

Adding to 321541321 its reverse (123145123), we get a palindrome (444686444).

The spelling of 321541321 in words is "three hundred twenty-one million, five hundred forty-one thousand, three hundred twenty-one".