11261221 has 2 divisors, whose sum is σ = 11261222. Its totient is φ = 11261220.

The previous prime is 11261219. The next prime is 11261231. The reversal of 11261221 is 12216211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7317025 + 3944196 = 2705^2 + 1986^2 .

It is a cyclic number.

It is not a de Polignac number, because 11261221 - 2¹ = 11261219 is a prime.

Together with 11261219, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 11261195 and 11261204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11261231) 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, 5630610 + 5630611.

It is an arithmetic number, because the mean of its divisors is an integer number (5630611).

Almost surely, 2^11261221 is an apocalyptic number.

It is an amenable number.

11261221 is a deficient number, since it is larger than the sum of its proper divisors (1).

11261221 is an equidigital number, since it uses as much as digits as its factorization.

11261221 is an odious number, because the sum of its binary digits is odd.

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

The square root of 11261221 is about 3355.7742772719. The cubic root of 11261221 is about 224.1447101178.

Adding to 11261221 its reverse (12216211), we get a palindrome (23477432).

The spelling of 11261221 in words is "eleven million, two hundred sixty-one thousand, two hundred twenty-one".