9011221 has 2 divisors, whose sum is σ = 9011222. Its totient is φ = 9011220.

The previous prime is 9011213. The next prime is 9011237. The reversal of 9011221 is 1221109.

It is an a-pointer prime, because the next prime (9011237) can be obtained adding 9011221 to its sum of digits (16).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5948721 + 3062500 = 2439^2 + 1750^2 .

It is a cyclic number.

It is not a de Polignac number, because 9011221 - 2³ = 9011213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 9011195 and 9011204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9011201) 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, 4505610 + 4505611.

It is an arithmetic number, because the mean of its divisors is an integer number (4505611).

Almost surely, 2^9011221 is an apocalyptic number.

It is an amenable number.

9011221 is a deficient number, since it is larger than the sum of its proper divisors (1).

9011221 is an equidigital number, since it uses as much as digits as its factorization.

9011221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 16.

The square root of 9011221 is about 3001.8695841092. The cubic root of 9011221 is about 208.0947931463.

It can be divided in two parts, 90 and 11221, that added together give a palindrome (11311).

The spelling of 9011221 in words is "nine million, eleven thousand, two hundred twenty-one".