10428021 has 20 divisors (see below), whose sum is σ = 16496172. Its totient is φ = 6542208.

The previous prime is 10428007. The next prime is 10428049. The reversal of 10428021 is 12082401.

It can be written as a sum of positive squares in 2 ways, for example, as 9696996 + 731025 = 3114^2 + 855^2 .

It is not a de Polignac number, because 10428021 - 2⁶ = 10427957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 10427985 and 10428003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10428001) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2410 + ... + 5163.

Almost surely, 2^10428021 is an apocalyptic number.

It is an amenable number.

10428021 is a deficient number, since it is larger than the sum of its proper divisors (6068151).

10428021 is an equidigital number, since it uses as much as digits as its factorization.

10428021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7602 (or 7593 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 10428021 is about 3229.2446485208. The cubic root of 10428021 is about 218.4744387604.

The spelling of 10428021 in words is "ten million, four hundred twenty-eight thousand, twenty-one".