10320021 has 16 divisors (see below), whose sum is σ = 16094400. Its totient is φ = 6517584.

The previous prime is 10319999. The next prime is 10320029. The reversal of 10320021 is 12002301.

It is a happy number.

It is not a de Polignac number, because 10320021 - 2⁵ = 10319989 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 10319985 and 10320012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10320029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9546 + ... + 10571.

It is an arithmetic number, because the mean of its divisors is an integer number (1005900).

Almost surely, 2^10320021 is an apocalyptic number.

It is an amenable number.

10320021 is a deficient number, since it is larger than the sum of its proper divisors (5774379).

10320021 is a wasteful number, since it uses less digits than its factorization.

10320021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20145 (or 20139 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 10320021 is about 3212.4789493474. The cubic root of 10320021 is about 217.7175943670.

Adding to 10320021 its reverse (12002301), we get a palindrome (22322322).

The spelling of 10320021 in words is "ten million, three hundred twenty thousand, twenty-one".