11228521 has 2 divisors, whose sum is σ = 11228522. Its totient is φ = 11228520.

The previous prime is 11228519. The next prime is 11228543. The reversal of 11228521 is 12582211.

It is an a-pointer prime, because the next prime (11228543) can be obtained adding 11228521 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7371225 + 3857296 = 2715^2 + 1964^2 .

It is a cyclic number.

It is not a de Polignac number, because 11228521 - 2¹ = 11228519 is a prime.

Together with 11228519, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 11228492 and 11228501.

It is not a weakly prime, because it can be changed into another prime (11228561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5614260 + 5614261.

It is an arithmetic number, because the mean of its divisors is an integer number (5614261).

Almost surely, 2^11228521 is an apocalyptic number.

It is an amenable number.

11228521 is a deficient number, since it is larger than the sum of its proper divisors (1).

11228521 is an equidigital number, since it uses as much as digits as its factorization.

11228521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 320, while the sum is 22.

The square root of 11228521 is about 3350.8985362138. The cubic root of 11228521 is about 223.9275448591.

The spelling of 11228521 in words is "eleven million, two hundred twenty-eight thousand, five hundred twenty-one".