321231013121 has 2 divisors, whose sum is σ = 321231013122. Its totient is φ = 321231013120.

The previous prime is 321231013091. The next prime is 321231013141. The reversal of 321231013121 is 121310132123.

It is a happy number.

It is an a-pointer prime, because the next prime (321231013141) can be obtained adding 321231013121 to its sum of digits (20).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 246532110400 + 74698902721 = 496520^2 + 273311^2 .

It is a cyclic number.

It is not a de Polignac number, because 321231013121 - 2⁶ = 321231013057 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 321231013093 and 321231013102.

It is not a weakly prime, because it can be changed into another prime (321231013141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160615506560 + 160615506561.

It is an arithmetic number, because the mean of its divisors is an integer number (160615506561).

Almost surely, 2^321231013121 is an apocalyptic number.

It is an amenable number.

321231013121 is a deficient number, since it is larger than the sum of its proper divisors (1).

321231013121 is an equidigital number, since it uses as much as digits as its factorization.

321231013121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 321231013121 its reverse (121310132123), we get a palindrome (442541145244).

The spelling of 321231013121 in words is "three hundred twenty-one billion, two hundred thirty-one million, thirteen thousand, one hundred twenty-one".