10644021 has 8 divisors (see below), whose sum is σ = 15768960. Its totient is φ = 7095996.

The previous prime is 10644019. The next prime is 10644037. The reversal of 10644021 is 12044601.

10644021 is a `hidden beast` number, since 1 + 0 + 644 + 0 + 21 = 666.

It is not a de Polignac number, because 10644021 - 2¹ = 10644019 is a prime.

It is a super-2 number, since 2×10644021² = 226590366096882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 10643985 and 10644003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10644001) 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 in 7 ways as a sum of consecutive naturals, for example, 197085 + ... + 197138.

It is an arithmetic number, because the mean of its divisors is an integer number (1971120).

Almost surely, 2^10644021 is an apocalyptic number.

It is an amenable number.

10644021 is a deficient number, since it is larger than the sum of its proper divisors (5124939).

10644021 is an equidigital number, since it uses as much as digits as its factorization.

10644021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394232 (or 394226 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 10644021 is about 3262.5175861595. The cubic root of 10644021 is about 219.9725930046.

Adding to 10644021 its reverse (12044601), we get a palindrome (22688622).

The spelling of 10644021 in words is "ten million, six hundred forty-four thousand, twenty-one".