2231231231321 has 2 divisors, whose sum is σ = 2231231231322. Its totient is φ = 2231231231320.

The previous prime is 2231231231297. The next prime is 2231231231353. The reversal of 2231231231321 is 1231321321322.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2220207281296 + 11023950025 = 1490036^2 + 104995^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2231231231321 is a prime.

It is a super-3 number, since 3×2231231231321³ (a number of 38 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (2231231231821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1115615615660 + 1115615615661.

It is an arithmetic number, because the mean of its divisors is an integer number (1115615615661).

Almost surely, 2^{2231231231321} is an apocalyptic number.

It is an amenable number.

2231231231321 is a deficient number, since it is larger than the sum of its proper divisors (1).

2231231231321 is an equidigital number, since it uses as much as digits as its factorization.

2231231231321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 26.

Adding to 2231231231321 its reverse (1231321321322), we get a palindrome (3462552552643).

Subtracting from 2231231231321 its reverse (1231321321322), we obtain a palindrome (999909909999).

The spelling of 2231231231321 in words is "two trillion, two hundred thirty-one billion, two hundred thirty-one million, two hundred thirty-one thousand, three hundred twenty-one".