9827221 has 2 divisors, whose sum is σ = 9827222. Its totient is φ = 9827220.

The previous prime is 9827203. The next prime is 9827243. The reversal of 9827221 is 1227289.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7535025 + 2292196 = 2745^2 + 1514^2 .

It is a cyclic number.

It is not a de Polignac number, because 9827221 - 2⁵ = 9827189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9827281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4913610 + 4913611.

It is an arithmetic number, because the mean of its divisors is an integer number (4913611).

Almost surely, 2^9827221 is an apocalyptic number.

It is an amenable number.

9827221 is a deficient number, since it is larger than the sum of its proper divisors (1).

9827221 is an equidigital number, since it uses as much as digits as its factorization.

9827221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4032, while the sum is 31.

The square root of 9827221 is about 3134.8398683186. The cubic root of 9827221 is about 214.1954498771.

The spelling of 9827221 in words is "nine million, eight hundred twenty-seven thousand, two hundred twenty-one".