21030020203 has 2 divisors, whose sum is σ = 21030020204. Its totient is φ = 21030020202.

The previous prime is 21030020197. The next prime is 21030020213. The reversal of 21030020203 is 30202003012.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21030020203 - 2⁹ = 21030019691 is a prime.

It is a super-2 number, since 2×21030020203² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21030020213) 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, 10515010101 + 10515010102.

It is an arithmetic number, because the mean of its divisors is an integer number (10515010102).

Almost surely, 2^21030020203 is an apocalyptic number.

21030020203 is a deficient number, since it is larger than the sum of its proper divisors (1).

21030020203 is an equidigital number, since it uses as much as digits as its factorization.

21030020203 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 13.

Adding to 21030020203 its reverse (30202003012), we get a palindrome (51232023215).

The spelling of 21030020203 in words is "twenty-one billion, thirty million, twenty thousand, two hundred three".