18221441369 has 2 divisors, whose sum is σ = 18221441370. Its totient is φ = 18221441368.

The previous prime is 18221441341. The next prime is 18221441401. The reversal of 18221441369 is 96314412281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17103408400 + 1118032969 = 130780^2 + 33437^2 .

It is an emirp because it is prime and its reverse (96314412281) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18221441369 is a prime.

It is a super-2 number, since 2×18221441369² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18221441669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9110720684 + 9110720685.

It is an arithmetic number, because the mean of its divisors is an integer number (9110720685).

Almost surely, 2^18221441369 is an apocalyptic number.

It is an amenable number.

18221441369 is a deficient number, since it is larger than the sum of its proper divisors (1).

18221441369 is an equidigital number, since it uses as much as digits as its factorization.

18221441369 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 82944, while the sum is 41.

The spelling of 18221441369 in words is "eighteen billion, two hundred twenty-one million, four hundred forty-one thousand, three hundred sixty-nine".