21000210163 has 2 divisors, whose sum is σ = 21000210164. Its totient is φ = 21000210162.

The previous prime is 21000210157. The next prime is 21000210221. The reversal of 21000210163 is 36101200012.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21000210163 is a prime.

It is not a weakly prime, because it can be changed into another prime (21000210463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500105081 + 10500105082.

It is an arithmetic number, because the mean of its divisors is an integer number (10500105082).

Almost surely, 2^21000210163 is an apocalyptic number.

21000210163 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000210163 is an equidigital number, since it uses as much as digits as its factorization.

21000210163 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 16.

Adding to 21000210163 its reverse (36101200012), we get a palindrome (57101410175).

The spelling of 21000210163 in words is "twenty-one billion, two hundred ten thousand, one hundred sixty-three".