1321330213943 has 2 divisors, whose sum is σ = 1321330213944. Its totient is φ = 1321330213942.

The previous prime is 1321330213921. The next prime is 1321330214137. The reversal of 1321330213943 is 3493120331231.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1321330213943 - 2²² = 1321326019639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321330213243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660665106971 + 660665106972.

It is an arithmetic number, because the mean of its divisors is an integer number (660665106972).

Almost surely, 2^{1321330213943} is an apocalyptic number.

1321330213943 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321330213943 is an equidigital number, since it uses as much as digits as its factorization.

1321330213943 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34992, while the sum is 35.

The spelling of 1321330213943 in words is "one trillion, three hundred twenty-one billion, three hundred thirty million, two hundred thirteen thousand, nine hundred forty-three".