11001206221 has 2 divisors, whose sum is σ = 11001206222. Its totient is φ = 11001206220.

The previous prime is 11001206219. The next prime is 11001206261. The reversal of 11001206221 is 12260210011.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11001072996 + 133225 = 104886^2 + 365^2 .

It is a cyclic number.

It is not a de Polignac number, because 11001206221 - 2¹ = 11001206219 is a prime.

Together with 11001206219, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 11001206195 and 11001206204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11001206201) 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, 5500603110 + 5500603111.

It is an arithmetic number, because the mean of its divisors is an integer number (5500603111).

Almost surely, 2^11001206221 is an apocalyptic number.

It is an amenable number.

11001206221 is a deficient number, since it is larger than the sum of its proper divisors (1).

11001206221 is an equidigital number, since it uses as much as digits as its factorization.

11001206221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 11001206221 its reverse (12260210011), we get a palindrome (23261416232).

The spelling of 11001206221 in words is "eleven billion, one million, two hundred six thousand, two hundred twenty-one".