11391104521 has 2 divisors, whose sum is σ = 11391104522. Its totient is φ = 11391104520.

The previous prime is 11391104449. The next prime is 11391104611. The reversal of 11391104521 is 12540119311.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9833697225 + 1557407296 = 99165^2 + 39464^2 .

It is a cyclic number.

It is not a de Polignac number, because 11391104521 - 2¹⁷ = 11390973449 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11391104521.

It is not a weakly prime, because it can be changed into another prime (11391104321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5695552260 + 5695552261.

It is an arithmetic number, because the mean of its divisors is an integer number (5695552261).

Almost surely, 2^11391104521 is an apocalyptic number.

It is an amenable number.

11391104521 is a deficient number, since it is larger than the sum of its proper divisors (1).

11391104521 is an equidigital number, since it uses as much as digits as its factorization.

11391104521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 28.

The spelling of 11391104521 in words is "eleven billion, three hundred ninety-one million, one hundred four thousand, five hundred twenty-one".