9620021 has 2 divisors, whose sum is σ = 9620022. Its totient is φ = 9620020.

The previous prime is 9619993. The next prime is 9620027. The reversal of 9620021 is 1200269.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6682225 + 2937796 = 2585^2 + 1714^2 .

It is a cyclic number.

It is not a de Polignac number, because 9620021 - 2¹⁴ = 9603637 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 9619975 and 9620002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9620027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4810010 + 4810011.

It is an arithmetic number, because the mean of its divisors is an integer number (4810011).

Almost surely, 2^9620021 is an apocalyptic number.

It is an amenable number.

9620021 is a deficient number, since it is larger than the sum of its proper divisors (1).

9620021 is an equidigital number, since it uses as much as digits as its factorization.

9620021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 9620021 is about 3101.6158691882. The cubic root of 9620021 is about 212.6793576849.

The spelling of 9620021 in words is "nine million, six hundred twenty thousand, twenty-one".