6911221 has 2 divisors, whose sum is σ = 6911222. Its totient is φ = 6911220.

The previous prime is 6911207. The next prime is 6911227. The reversal of 6911221 is 1221196.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6180196 + 731025 = 2486^2 + 855^2 .

It is a cyclic number.

It is not a de Polignac number, because 6911221 - 2⁵ = 6911189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6911192 and 6911201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6911227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3455610 + 3455611.

It is an arithmetic number, because the mean of its divisors is an integer number (3455611).

Almost surely, 2^6911221 is an apocalyptic number.

It is an amenable number.

6911221 is a deficient number, since it is larger than the sum of its proper divisors (1).

6911221 is an equidigital number, since it uses as much as digits as its factorization.

6911221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 216, while the sum is 22.

The square root of 6911221 is about 2628.9201205058. The cubic root of 6911221 is about 190.4809698017.

The spelling of 6911221 in words is "six million, nine hundred eleven thousand, two hundred twenty-one".