21055000163 has 2 divisors, whose sum is σ = 21055000164. Its totient is φ = 21055000162.

The previous prime is 21055000159. The next prime is 21055000199. The reversal of 21055000163 is 36100055012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21055000163 - 2² = 21055000159 is a prime.

It is not a weakly prime, because it can be changed into another prime (21055003163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10527500081 + 10527500082.

It is an arithmetic number, because the mean of its divisors is an integer number (10527500082).

Almost surely, 2^21055000163 is an apocalyptic number.

21055000163 is a deficient number, since it is larger than the sum of its proper divisors (1).

21055000163 is an equidigital number, since it uses as much as digits as its factorization.

21055000163 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 900, while the sum is 23.

Adding to 21055000163 its reverse (36100055012), we get a palindrome (57155055175).

The spelling of 21055000163 in words is "twenty-one billion, fifty-five million, one hundred sixty-three", and thus it is an aban number.