11220012521 has 2 divisors, whose sum is σ = 11220012522. Its totient is φ = 11220012520.

The previous prime is 11220012499. The next prime is 11220012523. The reversal of 11220012521 is 12521002211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6894977296 + 4325035225 = 83036^2 + 65765^2 .

It is an emirp because it is prime and its reverse (12521002211) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11220012521 is a prime.

Together with 11220012523, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11220012521.

It is not a weakly prime, because it can be changed into another prime (11220012523) 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, 5610006260 + 5610006261.

It is an arithmetic number, because the mean of its divisors is an integer number (5610006261).

Almost surely, 2^11220012521 is an apocalyptic number.

It is an amenable number.

11220012521 is a deficient number, since it is larger than the sum of its proper divisors (1).

11220012521 is an equidigital number, since it uses as much as digits as its factorization.

11220012521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80, while the sum is 17.

Adding to 11220012521 its reverse (12521002211), we get a palindrome (23741014732).

The spelling of 11220012521 in words is "eleven billion, two hundred twenty million, twelve thousand, five hundred twenty-one".