321231122221 has 4 divisors (see below), whose sum is σ = 332308057500. Its totient is φ = 310154186944.

The previous prime is 321231122207. The next prime is 321231122243. The reversal of 321231122221 is 122221132123.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122221132123 = 31063 ⋅3934621.

It can be written as a sum of positive squares in 2 ways, for example, as 131579582121 + 189651540100 = 362739^2 + 435490^2 .

It is a cyclic number.

It is not a de Polignac number, because 321231122221 - 2²¹ = 321229025069 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 321231122192 and 321231122201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321231122281) 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, 5538467596 + ... + 5538467653.

It is an arithmetic number, because the mean of its divisors is an integer number (83077014375).

Almost surely, 2^321231122221 is an apocalyptic number.

It is an amenable number.

321231122221 is a deficient number, since it is larger than the sum of its proper divisors (11076935279).

321231122221 is a wasteful number, since it uses less digits than its factorization.

321231122221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11076935278.

The product of its digits is 576, while the sum is 22.

Adding to 321231122221 its reverse (122221132123), we get a palindrome (443452254344).

The spelling of 321231122221 in words is "three hundred twenty-one billion, two hundred thirty-one million, one hundred twenty-two thousand, two hundred twenty-one".