1221320404303 has 2 divisors, whose sum is σ = 1221320404304. Its totient is φ = 1221320404302.

The previous prime is 1221320404229. The next prime is 1221320404333. The reversal of 1221320404303 is 3034040231221.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221320404303 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221320404333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610660202151 + 610660202152.

It is an arithmetic number, because the mean of its divisors is an integer number (610660202152).

Almost surely, 2^{1221320404303} is an apocalyptic number.

1221320404303 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221320404303 is an equidigital number, since it uses as much as digits as its factorization.

1221320404303 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 1221320404303 its reverse (3034040231221), we get a palindrome (4255360635524).

The spelling of 1221320404303 in words is "one trillion, two hundred twenty-one billion, three hundred twenty million, four hundred four thousand, three hundred three".