1321335455431 has 2 divisors, whose sum is σ = 1321335455432. Its totient is φ = 1321335455430.

The previous prime is 1321335455413. The next prime is 1321335455477. The reversal of 1321335455431 is 1345545331231.

Together with previous prime (1321335455413) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1321335455431 - 2⁹ = 1321335454919 is a prime.

It is a super-2 number, since 2×1321335455431² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321335455411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660667727715 + 660667727716.

It is an arithmetic number, because the mean of its divisors is an integer number (660667727716).

Almost surely, 2^{1321335455431} is an apocalyptic number.

1321335455431 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321335455431 is an equidigital number, since it uses as much as digits as its factorization.

1321335455431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 324000, while the sum is 40.

The spelling of 1321335455431 in words is "one trillion, three hundred twenty-one billion, three hundred thirty-five million, four hundred fifty-five thousand, four hundred thirty-one".