1321443310373 has 2 divisors, whose sum is σ = 1321443310374. Its totient is φ = 1321443310372.

The previous prime is 1321443310303. The next prime is 1321443310417. The reversal of 1321443310373 is 3730133441231.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1273902740929 + 47540569444 = 1128673^2 + 218038^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321443310373 - 2¹⁶ = 1321443244837 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321443310303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660721655186 + 660721655187.

It is an arithmetic number, because the mean of its divisors is an integer number (660721655187).

Almost surely, 2^{1321443310373} is an apocalyptic number.

It is an amenable number.

1321443310373 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321443310373 is an equidigital number, since it uses as much as digits as its factorization.

1321443310373 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 35.

The spelling of 1321443310373 in words is "one trillion, three hundred twenty-one billion, four hundred forty-three million, three hundred ten thousand, three hundred seventy-three".