21020100163 has 2 divisors, whose sum is σ = 21020100164. Its totient is φ = 21020100162.

The previous prime is 21020100151. The next prime is 21020100239. The reversal of 21020100163 is 36100102012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21020100163 - 2⁹ = 21020099651 is a prime.

It is a super-2 number, since 2×21020100163² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21020100863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510050081 + 10510050082.

It is an arithmetic number, because the mean of its divisors is an integer number (10510050082).

Almost surely, 2^21020100163 is an apocalyptic number.

21020100163 is a deficient number, since it is larger than the sum of its proper divisors (1).

21020100163 is an equidigital number, since it uses as much as digits as its factorization.

21020100163 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21020100163 its reverse (36100102012), we get a palindrome (57120202175).

The spelling of 21020100163 in words is "twenty-one billion, twenty million, one hundred thousand, one hundred sixty-three".