1321342137553 has 2 divisors, whose sum is σ = 1321342137554. Its totient is φ = 1321342137552.

The previous prime is 1321342137541. The next prime is 1321342137559. The reversal of 1321342137553 is 3557312431231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1263079281424 + 58262856129 = 1123868^2 + 241377^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321342137553 - 2³³ = 1312752202961 is a prime.

It is not a weakly prime, because it can be changed into another prime (1321342137559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660671068776 + 660671068777.

It is an arithmetic number, because the mean of its divisors is an integer number (660671068777).

Almost surely, 2^{1321342137553} is an apocalyptic number.

It is an amenable number.

1321342137553 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321342137553 is an equidigital number, since it uses as much as digits as its factorization.

1321342137553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 226800, while the sum is 40.

Adding to 1321342137553 its reverse (3557312431231), we get a palindrome (4878654568784).

The spelling of 1321342137553 in words is "one trillion, three hundred twenty-one billion, three hundred forty-two million, one hundred thirty-seven thousand, five hundred fifty-three".