13561221041 has 2 divisors, whose sum is σ = 13561221042. Its totient is φ = 13561221040.

The previous prime is 13561221031. The next prime is 13561221073. The reversal of 13561221041 is 14012216531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12245635600 + 1315585441 = 110660^2 + 36271^2 .

It is an emirp because it is prime and its reverse (14012216531) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13561221041 is a prime.

It is a super-2 number, since 2×13561221041² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 13561221041.

It is not a weakly prime, because it can be changed into another prime (13561221031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6780610520 + 6780610521.

It is an arithmetic number, because the mean of its divisors is an integer number (6780610521).

Almost surely, 2^13561221041 is an apocalyptic number.

It is an amenable number.

13561221041 is a deficient number, since it is larger than the sum of its proper divisors (1).

13561221041 is an equidigital number, since it uses as much as digits as its factorization.

13561221041 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 26.

Adding to 13561221041 its reverse (14012216531), we get a palindrome (27573437572).

The spelling of 13561221041 in words is "thirteen billion, five hundred sixty-one million, two hundred twenty-one thousand, forty-one".