1221303313 has 2 divisors, whose sum is σ = 1221303314. Its totient is φ = 1221303312.

The previous prime is 1221303287. The next prime is 1221303323. The reversal of 1221303313 is 3133031221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 698174929 + 523128384 = 26423^2 + 22872^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221303313 - 2¹³ = 1221295121 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221303323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610651656 + 610651657.

It is an arithmetic number, because the mean of its divisors is an integer number (610651657).

Almost surely, 2^1221303313 is an apocalyptic number.

It is an amenable number.

1221303313 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221303313 is an equidigital number, since it uses as much as digits as its factorization.

1221303313 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 19.

The square root of 1221303313 is about 34947.1502843937. The cubic root of 1221303313 is about 1068.9100943762.

Adding to 1221303313 its reverse (3133031221), we get a palindrome (4354334534).

The spelling of 1221303313 in words is "one billion, two hundred twenty-one million, three hundred three thousand, three hundred thirteen".