21636036203 has 2 divisors, whose sum is σ = 21636036204. Its totient is φ = 21636036202.

The previous prime is 21636036199. The next prime is 21636036209. The reversal of 21636036203 is 30263063612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21636036203 - 2² = 21636036199 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21636036203.

It is not a weakly prime, because it can be changed into another prime (21636036209) 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, 10818018101 + 10818018102.

It is an arithmetic number, because the mean of its divisors is an integer number (10818018102).

Almost surely, 2^21636036203 is an apocalyptic number.

21636036203 is a deficient number, since it is larger than the sum of its proper divisors (1).

21636036203 is an equidigital number, since it uses as much as digits as its factorization.

21636036203 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 32.

Adding to 21636036203 its reverse (30263063612), we get a palindrome (51899099815).

The spelling of 21636036203 in words is "twenty-one billion, six hundred thirty-six million, thirty-six thousand, two hundred three".