321143212121 has 4 divisors (see below), whose sum is σ = 321146264244. Its totient is φ = 321140160000.

The previous prime is 321143212037. The next prime is 321143212133. The reversal of 321143212121 is 121212341123.

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 81861793225 + 239281418896 = 286115^2 + 489164^2 .

It is a cyclic number.

It is not a de Polignac number, because 321143212121 - 2¹⁸ = 321142949977 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (321143212021) 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, 1362380 + ... + 1580621.

It is an arithmetic number, because the mean of its divisors is an integer number (80286566061).

Almost surely, 2^321143212121 is an apocalyptic number.

It is an amenable number.

321143212121 is a deficient number, since it is larger than the sum of its proper divisors (3052123).

321143212121 is a wasteful number, since it uses less digits than its factorization.

321143212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3052122.

The product of its digits is 576, while the sum is 23.

Adding to 321143212121 its reverse (121212341123), we get a palindrome (442355553244).

The spelling of 321143212121 in words is "three hundred twenty-one billion, one hundred forty-three million, two hundred twelve thousand, one hundred twenty-one".