21003203320201 has 2 divisors, whose sum is σ = 21003203320202. Its totient is φ = 21003203320200.

The previous prime is 21003203320171. The next prime is 21003203320261. The reversal of 21003203320201 is 10202330230012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17010304166025 + 3992899154176 = 4124355^2 + 1998224^2 .

It is a cyclic number.

It is not a de Polignac number, because 21003203320201 - 2¹³ = 21003203312009 is a prime.

It is a super-2 number, since 2×21003203320201² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21003203320261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10501601660100 + 10501601660101.

It is an arithmetic number, because the mean of its divisors is an integer number (10501601660101).

Almost surely, 2^{21003203320201} is an apocalyptic number.

It is an amenable number.

21003203320201 is a deficient number, since it is larger than the sum of its proper divisors (1).

21003203320201 is an equidigital number, since it uses as much as digits as its factorization.

21003203320201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21003203320201 its reverse (10202330230012), we get a palindrome (31205533550213).

The spelling of 21003203320201 in words is "twenty-one trillion, three billion, two hundred three million, three hundred twenty thousand, two hundred one".