1221444244313 has 2 divisors, whose sum is σ = 1221444244314. Its totient is φ = 1221444244312.

The previous prime is 1221444244309. The next prime is 1221444244373. The reversal of 1221444244313 is 3134424441221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 887207634889 + 334236609424 = 941917^2 + 578132^2 .

It is an emirp because it is prime and its reverse (3134424441221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1221444244313 - 2² = 1221444244309 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221444244373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610722122156 + 610722122157.

It is an arithmetic number, because the mean of its divisors is an integer number (610722122157).

Almost surely, 2^{1221444244313} is an apocalyptic number.

It is an amenable number.

1221444244313 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221444244313 is an equidigital number, since it uses as much as digits as its factorization.

1221444244313 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 73728, while the sum is 35.

Adding to 1221444244313 its reverse (3134424441221), we get a palindrome (4355868685534).

The spelling of 1221444244313 in words is "one trillion, two hundred twenty-one billion, four hundred forty-four million, two hundred forty-four thousand, three hundred thirteen".