1231322011321 has 2 divisors, whose sum is σ = 1231322011322. Its totient is φ = 1231322011320.

The previous prime is 1231322011313. The next prime is 1231322011379. The reversal of 1231322011321 is 1231102231321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 741259009296 + 490063002025 = 860964^2 + 700045^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231322011321 - 2³ = 1231322011313 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1231322011292 and 1231322011301.

It is not a weakly prime, because it can be changed into another prime (1231322011391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615661005660 + 615661005661.

It is an arithmetic number, because the mean of its divisors is an integer number (615661005661).

Almost surely, 2^{1231322011321} is an apocalyptic number.

It is an amenable number.

1231322011321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231322011321 is an equidigital number, since it uses as much as digits as its factorization.

1231322011321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 1231322011321 its reverse (1231102231321), we get a palindrome (2462424242642).

The spelling of 1231322011321 in words is "one trillion, two hundred thirty-one billion, three hundred twenty-two million, eleven thousand, three hundred twenty-one".