11206521 has 6 divisors (see below), whose sum is σ = 16187210. Its totient is φ = 7471008.

The previous prime is 11206513. The next prime is 11206541. The reversal of 11206521 is 12560211.

11206521 is a `hidden beast` number, since 1 + 12 + 0 + 652 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 11148921 + 57600 = 3339^2 + 240^2 .

It is not a de Polignac number, because 11206521 - 2³ = 11206513 is a prime.

It is a super-2 number, since 2×11206521² = 251172225846882, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11206494 and 11206503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11206501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 622576 + ... + 622593.

Almost surely, 2^11206521 is an apocalyptic number.

It is an amenable number.

11206521 is a deficient number, since it is larger than the sum of its proper divisors (4980689).

11206521 is a wasteful number, since it uses less digits than its factorization.

11206521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1245175 (or 1245172 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 11206521 is about 3347.6142250863. The cubic root of 11206521 is about 223.7812024357.

Adding to 11206521 its reverse (12560211), we get a palindrome (23766732).

It can be divided in two parts, 112065 and 21, that multiplied together give a triangular number (2353365 = T₂₁₆₉).

The spelling of 11206521 in words is "eleven million, two hundred six thousand, five hundred twenty-one".