9922021 has 2 divisors, whose sum is σ = 9922022. Its totient is φ = 9922020.

The previous prime is 9922019. The next prime is 9922043. The reversal of 9922021 is 1202299.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7317025 + 2604996 = 2705^2 + 1614^2 .

It is a cyclic number.

It is not a de Polignac number, because 9922021 - 2¹ = 9922019 is a prime.

Together with 9922019, it forms a pair of twin primes.

9922021 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9922001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4961010 + 4961011.

It is an arithmetic number, because the mean of its divisors is an integer number (4961011).

Almost surely, 2^9922021 is an apocalyptic number.

It is an amenable number.

9922021 is a deficient number, since it is larger than the sum of its proper divisors (1).

9922021 is an equidigital number, since it uses as much as digits as its factorization.

9922021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 9922021 is about 3149.9239673364. The cubic root of 9922021 is about 214.8820048415.

The spelling of 9922021 in words is "nine million, nine hundred twenty-two thousand, twenty-one".