11103541578221 has 2 divisors, whose sum is σ = 11103541578222. Its totient is φ = 11103541578220.

The previous prime is 11103541578203. The next prime is 11103541578257. The reversal of 11103541578221 is 12287514530111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10058824549225 + 1044717028996 = 3171565^2 + 1022114^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11103541578221 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11105541578221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5551770789110 + 5551770789111.

It is an arithmetic number, because the mean of its divisors is an integer number (5551770789111).

Almost surely, 2^{11103541578221} is an apocalyptic number.

It is an amenable number.

11103541578221 is a deficient number, since it is larger than the sum of its proper divisors (1).

11103541578221 is an equidigital number, since it uses as much as digits as its factorization.

11103541578221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 67200, while the sum is 41.

The spelling of 11103541578221 in words is "eleven trillion, one hundred three billion, five hundred forty-one million, five hundred seventy-eight thousand, two hundred twenty-one".