321222120421 has 4 divisors (see below), whose sum is σ = 326666563200. Its totient is φ = 315777677644.

The previous prime is 321222120409. The next prime is 321222120437. The reversal of 321222120421 is 124021222123.

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, and also an emirpimes, since its reverse is a distinct semiprime: 124021222123 = 73 ⋅1698920851.

It is a cyclic number.

It is not a de Polignac number, because 321222120421 - 2¹⁹ = 321221596133 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 321222120392 and 321222120401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321222120491) 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 3 ways as a sum of consecutive naturals, for example, 2722221301 + ... + 2722221418.

It is an arithmetic number, because the mean of its divisors is an integer number (81666640800).

Almost surely, 2^321222120421 is an apocalyptic number.

It is an amenable number.

321222120421 is a deficient number, since it is larger than the sum of its proper divisors (5444442779).

321222120421 is an equidigital number, since it uses as much as digits as its factorization.

321222120421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5444442778.

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 321222120421 its reverse (124021222123), we get a palindrome (445243342544).

The spelling of 321222120421 in words is "three hundred twenty-one billion, two hundred twenty-two million, one hundred twenty thousand, four hundred twenty-one".