10203100021 has 2 divisors, whose sum is σ = 10203100022. Its totient is φ = 10203100020.

The previous prime is 10203100009. The next prime is 10203100043. The reversal of 10203100021 is 12000130201.

10203100021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7331640625 + 2871459396 = 85625^2 + 53586^2 .

It is a cyclic number.

It is not a de Polignac number, because 10203100021 - 2¹⁵ = 10203067253 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 10203099980 and 10203100007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10203100321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5101550010 + 5101550011.

It is an arithmetic number, because the mean of its divisors is an integer number (5101550011).

Almost surely, 2^10203100021 is an apocalyptic number.

It is an amenable number.

10203100021 is a deficient number, since it is larger than the sum of its proper divisors (1).

10203100021 is an equidigital number, since it uses as much as digits as its factorization.

10203100021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12, while the sum is 10.

Adding to 10203100021 its reverse (12000130201), we get a palindrome (22203230222).

It can be divided in two parts, 10203 and 100021, that added together give a square (110224 = 332²).

The spelling of 10203100021 in words is "ten billion, two hundred three million, one hundred thousand, twenty-one".