9421921 has 2 divisors, whose sum is σ = 9421922. Its totient is φ = 9421920.

The previous prime is 9421903. The next prime is 9421931. The reversal of 9421921 is 1291249.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7639696 + 1782225 = 2764^2 + 1335^2 .

It is an emirp because it is prime and its reverse (1291249) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9421921 - 2⁷ = 9421793 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9421921.

It is not a weakly prime, because it can be changed into another prime (9421931) 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, 4710960 + 4710961.

It is an arithmetic number, because the mean of its divisors is an integer number (4710961).

Almost surely, 2^9421921 is an apocalyptic number.

It is an amenable number.

9421921 is a deficient number, since it is larger than the sum of its proper divisors (1).

9421921 is an equidigital number, since it uses as much as digits as its factorization.

9421921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 28.

The square root of 9421921 is about 3069.5147825023. The cubic root of 9421921 is about 211.2093562320.

The spelling of 9421921 in words is "nine million, four hundred twenty-one thousand, nine hundred twenty-one".