1321123140457 has 2 divisors, whose sum is σ = 1321123140458. Its totient is φ = 1321123140456.

The previous prime is 1321123140413. The next prime is 1321123140479. The reversal of 1321123140457 is 7540413211231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1280543455321 + 40579685136 = 1131611^2 + 201444^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321123140457 - 2⁷ = 1321123140329 is a prime.

It is not a weakly prime, because it can be changed into another prime (1321123140497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660561570228 + 660561570229.

It is an arithmetic number, because the mean of its divisors is an integer number (660561570229).

Almost surely, 2^{1321123140457} is an apocalyptic number.

It is an amenable number.

1321123140457 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321123140457 is an equidigital number, since it uses as much as digits as its factorization.

1321123140457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20160, while the sum is 34.

Adding to 1321123140457 its reverse (7540413211231), we get a palindrome (8861536351688).

The spelling of 1321123140457 in words is "one trillion, three hundred twenty-one billion, one hundred twenty-three million, one hundred forty thousand, four hundred fifty-seven".