9735221 has 2 divisors, whose sum is σ = 9735222. Its totient is φ = 9735220.

The previous prime is 9735217. The next prime is 9735223. The reversal of 9735221 is 1225379.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8916196 + 819025 = 2986^2 + 905^2 .

It is a cyclic number.

It is not a de Polignac number, because 9735221 - 2² = 9735217 is a prime.

Together with 9735223, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9735223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4867610 + 4867611.

It is an arithmetic number, because the mean of its divisors is an integer number (4867611).

Almost surely, 2^9735221 is an apocalyptic number.

It is an amenable number.

9735221 is a deficient number, since it is larger than the sum of its proper divisors (1).

9735221 is an equidigital number, since it uses as much as digits as its factorization.

9735221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3780, while the sum is 29.

The square root of 9735221 is about 3120.1315677388. The cubic root of 9735221 is about 213.5249382647.

The spelling of 9735221 in words is "nine million, seven hundred thirty-five thousand, two hundred twenty-one".