10009921 has 2 divisors, whose sum is σ = 10009922. Its totient is φ = 10009920.

The previous prime is 10009907. The next prime is 10009933. The reversal of 10009921 is 12990001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9235521 + 774400 = 3039^2 + 880^2 .

It is a cyclic number.

It is not a de Polignac number, because 10009921 - 2¹¹ = 10007873 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 10009892 and 10009901.

It is not a weakly prime, because it can be changed into another prime (10009981) 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, 5004960 + 5004961.

It is an arithmetic number, because the mean of its divisors is an integer number (5004961).

Almost surely, 2^10009921 is an apocalyptic number.

It is an amenable number.

10009921 is a deficient number, since it is larger than the sum of its proper divisors (1).

10009921 is an equidigital number, since it uses as much as digits as its factorization.

10009921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162, while the sum is 22.

The square root of 10009921 is about 3163.8459191307. The cubic root of 10009921 is about 215.5146926099.

Adding to 10009921 its reverse (12990001), we get a palindrome (22999922).

The spelling of 10009921 in words is "ten million, nine thousand, nine hundred twenty-one".