1221330313 has 8 divisors (see below), whose sum is σ = 1401798528. Its totient is φ = 1042360224.

The previous prime is 1221330301. The next prime is 1221330377. The reversal of 1221330313 is 3130331221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221330313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221330413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 372781 + ... + 376042.

It is an arithmetic number, because the mean of its divisors is an integer number (175224816).

Almost surely, 2^1221330313 is an apocalyptic number.

It is an amenable number.

1221330313 is a deficient number, since it is larger than the sum of its proper divisors (180468215).

1221330313 is an equidigital number, since it uses as much as digits as its factorization.

1221330313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 749063.

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

The square root of 1221330313 is about 34947.5365798507. The cubic root of 1221330313 is about 1068.9179713056.

Adding to 1221330313 its reverse (3130331221), we get a palindrome (4351661534).

The spelling of 1221330313 in words is "one billion, two hundred twenty-one million, three hundred thirty thousand, three hundred thirteen".