1321321040203 has 2 divisors, whose sum is σ = 1321321040204. Its totient is φ = 1321321040202.

The previous prime is 1321321040201. The next prime is 1321321040227. The reversal of 1321321040203 is 3020401231231.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1321321040203 - 2¹ = 1321321040201 is a prime.

Together with 1321321040201, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1321321040201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660660520101 + 660660520102.

It is an arithmetic number, because the mean of its divisors is an integer number (660660520102).

Almost surely, 2^{1321321040203} is an apocalyptic number.

1321321040203 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321321040203 is an equidigital number, since it uses as much as digits as its factorization.

1321321040203 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 1321321040203 its reverse (3020401231231), we get a palindrome (4341722271434).

The spelling of 1321321040203 in words is "one trillion, three hundred twenty-one billion, three hundred twenty-one million, forty thousand, two hundred three".