11206721 has 2 divisors, whose sum is σ = 11206722. Its totient is φ = 11206720.

The previous prime is 11206697. The next prime is 11206729. The reversal of 11206721 is 12760211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10627600 + 579121 = 3260^2 + 761^2 .

It is a cyclic number.

It is not a de Polignac number, because 11206721 - 2¹⁰ = 11205697 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11206693 and 11206702.

It is not a weakly prime, because it can be changed into another prime (11206729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5603360 + 5603361.

It is an arithmetic number, because the mean of its divisors is an integer number (5603361).

Almost surely, 2^11206721 is an apocalyptic number.

It is an amenable number.

11206721 is a deficient number, since it is larger than the sum of its proper divisors (1).

11206721 is an equidigital number, since it uses as much as digits as its factorization.

11206721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 168, while the sum is 20.

The square root of 11206721 is about 3347.6440969733. The cubic root of 11206721 is about 223.7825336836.

Adding to 11206721 its reverse (12760211), we get a palindrome (23966932).

The spelling of 11206721 in words is "eleven million, two hundred six thousand, seven hundred twenty-one".