321204422321221 has 4 divisors (see below), whose sum is σ = 326470068588844. Its totient is φ = 315938776053600.

The previous prime is 321204422321219. The next prime is 321204422321281. The reversal of 321204422321221 is 122123224402123.

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 19154968936321 + 302049453384900 = 4376639^2 + 17379570^2 .

It is not a de Polignac number, because 321204422321221 - 2¹ = 321204422321219 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 (321204422321281) 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, 2632823133720 + ... + 2632823133841.

It is an arithmetic number, because the mean of its divisors is an integer number (81617517147211).

Almost surely, 2^{321204422321221} is an apocalyptic number.

It is an amenable number.

321204422321221 is a deficient number, since it is larger than the sum of its proper divisors (5265646267623).

321204422321221 is an equidigital number, since it uses as much as digits as its factorization.

321204422321221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5265646267622.

The product of its (nonzero) digits is 18432, while the sum is 31.

Adding to 321204422321221 its reverse (122123224402123), we get a palindrome (443327646723344).

The spelling of 321204422321221 in words is "three hundred twenty-one trillion, two hundred four billion, four hundred twenty-two million, three hundred twenty-one thousand, two hundred twenty-one".