10644921 has 24 divisors (see below), whose sum is σ = 18499520. Its totient is φ = 5762016.

The previous prime is 10644913. The next prime is 10644923. The reversal of 10644921 is 12944601.

10644921 is a `hidden beast` number, since 10 + 644 + 9 + 2 + 1 = 666.

It is not a de Polignac number, because 10644921 - 2³ = 10644913 is a prime.

It is a super-2 number, since 2×10644921² = 226628686192482, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (10644923) 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 23 ways as a sum of consecutive naturals, for example, 3250 + ... + 5643.

Almost surely, 2^10644921 is an apocalyptic number.

It is an amenable number.

10644921 is a deficient number, since it is larger than the sum of its proper divisors (7854599).

10644921 is a wasteful number, since it uses less digits than its factorization.

10644921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8925 (or 8922 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 10644921 is about 3262.6555135349. The cubic root of 10644921 is about 219.9787927216.

The spelling of 10644921 in words is "ten million, six hundred forty-four thousand, nine hundred twenty-one".