11505212011 has 2 divisors, whose sum is σ = 11505212012. Its totient is φ = 11505212010.

The previous prime is 11505211973. The next prime is 11505212023. The reversal of 11505212011 is 11021250511.

It is a strong prime.

It is an emirp because it is prime and its reverse (11021250511) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11505212011 - 2¹⁹ = 11504687723 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11505212011.

It is not a weakly prime, because it can be changed into another prime (11505212041) 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, 5752606005 + 5752606006.

It is an arithmetic number, because the mean of its divisors is an integer number (5752606006).

Almost surely, 2^11505212011 is an apocalyptic number.

11505212011 is a deficient number, since it is larger than the sum of its proper divisors (1).

11505212011 is an equidigital number, since it uses as much as digits as its factorization.

11505212011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 100, while the sum is 19.

Adding to 11505212011 its reverse (11021250511), we get a palindrome (22526462522).

The spelling of 11505212011 in words is "eleven billion, five hundred five million, two hundred twelve thousand, eleven".