10203021 has 12 divisors (see below), whose sum is σ = 14825148. Its totient is φ = 6761664.

The previous prime is 10203013. The next prime is 10203023. The reversal of 10203021 is 12030201.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 6687396 + 3515625 = 2586^2 + 1875^2 .

It is not a de Polignac number, because 10203021 - 2³ = 10203013 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 = 10202994 and 10203012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10203023) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1720 + ... + 4833.

It is an arithmetic number, because the mean of its divisors is an integer number (1235429).

Almost surely, 2^10203021 is an apocalyptic number.

It is an amenable number.

10203021 is a deficient number, since it is larger than the sum of its proper divisors (4622127).

10203021 is a wasteful number, since it uses less digits than its factorization.

10203021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6732 (or 6729 counting only the distinct ones).

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

The square root of 10203021 is about 3194.2168054157. The cubic root of 10203021 is about 216.8916970371.

Adding to 10203021 its reverse (12030201), we get a palindrome (22233222).

The spelling of 10203021 in words is "ten million, two hundred three thousand, twenty-one".