13320443621 has 2 divisors, whose sum is σ = 13320443622. Its totient is φ = 13320443620.

The previous prime is 13320443573. The next prime is 13320443627. The reversal of 13320443621 is 12634402331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10022812996 + 3297630625 = 100114^2 + 57425^2 .

It is an emirp because it is prime and its reverse (12634402331) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13320443621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13320443627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6660221810 + 6660221811.

It is an arithmetic number, because the mean of its divisors is an integer number (6660221811).

Almost surely, 2^13320443621 is an apocalyptic number.

It is an amenable number.

13320443621 is a deficient number, since it is larger than the sum of its proper divisors (1).

13320443621 is an equidigital number, since it uses as much as digits as its factorization.

13320443621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 29.

Adding to 13320443621 its reverse (12634402331), we get a palindrome (25954845952).

The spelling of 13320443621 in words is "thirteen billion, three hundred twenty million, four hundred forty-three thousand, six hundred twenty-one".