321440143103221 has 4 divisors (see below), whose sum is σ = 321446722355532. Its totient is φ = 321433563850912.

The previous prime is 321440143103197. The next prime is 321440143103237. The reversal of 321440143103221 is 122301341044123.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 301616544486321 + 19823598616900 = 17367111^2 + 4452370^2 .

It is a cyclic number.

It is not a de Polignac number, because 321440143103221 - 2²³ = 321440134714613 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 (321440143103921) 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, 3289552870 + ... + 3289650583.

It is an arithmetic number, because the mean of its divisors is an integer number (80361680588883).

Almost surely, 2^{321440143103221} is an apocalyptic number.

It is an amenable number.

321440143103221 is a deficient number, since it is larger than the sum of its proper divisors (6579252311).

321440143103221 is an equidigital number, since it uses as much as digits as its factorization.

321440143103221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6579252310.

The product of its (nonzero) digits is 13824, while the sum is 31.

Adding to 321440143103221 its reverse (122301341044123), we get a palindrome (443741484147344).

The spelling of 321440143103221 in words is "three hundred twenty-one trillion, four hundred forty billion, one hundred forty-three million, one hundred three thousand, two hundred twenty-one".