8811221 has 2 divisors, whose sum is σ = 8811222. Its totient is φ = 8811220.

The previous prime is 8811211. The next prime is 8811227. The reversal of 8811221 is 1221188.

It is a happy number.

8811221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7623121 + 1188100 = 2761^2 + 1090^2 .

It is a cyclic number.

It is not a de Polignac number, because 8811221 - 2¹⁴ = 8794837 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8811227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4405610 + 4405611.

It is an arithmetic number, because the mean of its divisors is an integer number (4405611).

Almost surely, 2^8811221 is an apocalyptic number.

It is an amenable number.

8811221 is a deficient number, since it is larger than the sum of its proper divisors (1).

8811221 is an equidigital number, since it uses as much as digits as its factorization.

8811221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 256, while the sum is 23.

The square root of 8811221 is about 2968.3700914812. The cubic root of 8811221 is about 206.5437374500.

It can be divided in two parts, 881 and 1221, that multiplied together give a palindrome (1075701).

The spelling of 8811221 in words is "eight million, eight hundred eleven thousand, two hundred twenty-one".