10021689 has 6 divisors (see below), whose sum is σ = 14475786. Its totient is φ = 6681120.

The previous prime is 10021663. The next prime is 10021699. The reversal of 10021689 is 98612001.

It can be written as a sum of positive squares in only one way, i.e., 6335289 + 3686400 = 2517^2 + 1920^2 .

It is not a de Polignac number, because 10021689 - 2¹⁵ = 9988921 is a prime.

It is not an unprimeable number, because it can be changed into a prime (10021639) 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 5 ways as a sum of consecutive naturals, for example, 556752 + ... + 556769.

It is an arithmetic number, because the mean of its divisors is an integer number (2412631).

Almost surely, 2^10021689 is an apocalyptic number.

It is an amenable number.

10021689 is a deficient number, since it is larger than the sum of its proper divisors (4454097).

10021689 is a wasteful number, since it uses less digits than its factorization.

10021689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1113527 (or 1113524 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 10021689 is about 3165.7051347212. The cubic root of 10021689 is about 215.5991149772.

The spelling of 10021689 in words is "ten million, twenty-one thousand, six hundred eighty-nine".