21012001163 has 2 divisors, whose sum is σ = 21012001164. Its totient is φ = 21012001162.

The previous prime is 21012001121. The next prime is 21012001211. The reversal of 21012001163 is 36110021012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21012001163 - 2³⁰ = 19938259339 is a prime.

It is not a weakly prime, because it can be changed into another prime (21012001663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506000581 + 10506000582.

It is an arithmetic number, because the mean of its divisors is an integer number (10506000582).

Almost surely, 2^21012001163 is an apocalyptic number.

21012001163 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012001163 is an equidigital number, since it uses as much as digits as its factorization.

21012001163 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 17.

Adding to 21012001163 its reverse (36110021012), we get a palindrome (57122022175).

The spelling of 21012001163 in words is "twenty-one billion, twelve million, one thousand, one hundred sixty-three".