11001111084521 has 2 divisors, whose sum is σ = 11001111084522. Its totient is φ = 11001111084520.

The previous prime is 11001111084517. The next prime is 11001111084529. The reversal of 11001111084521 is 12548011110011.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7293699469225 + 3707411615296 = 2700685^2 + 1925464^2 .

It is a cyclic number.

It is not a de Polignac number, because 11001111084521 - 2² = 11001111084517 is a prime.

It is not a weakly prime, because it can be changed into another prime (11001111084529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5500555542260 + 5500555542261.

It is an arithmetic number, because the mean of its divisors is an integer number (5500555542261).

Almost surely, 2^{11001111084521} is an apocalyptic number.

It is an amenable number.

11001111084521 is a deficient number, since it is larger than the sum of its proper divisors (1).

11001111084521 is an equidigital number, since it uses as much as digits as its factorization.

11001111084521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 320, while the sum is 26.

Adding to 11001111084521 its reverse (12548011110011), we get a palindrome (23549122194532).

The spelling of 11001111084521 in words is "eleven trillion, one billion, one hundred eleven million, eighty-four thousand, five hundred twenty-one".