21000163105 has 16 divisors (see below), whose sum is σ = 25512689664. Its totient is φ = 16592990400.

The previous prime is 21000163103. The next prime is 21000163111. The reversal of 21000163105 is 50136100012.

It is not a de Polignac number, because 21000163105 - 2¹ = 21000163103 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21000163103) 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 in 15 ways as a sum of consecutive naturals, for example, 67455 + ... + 215755.

It is an arithmetic number, because the mean of its divisors is an integer number (1594543104).

Almost surely, 2^21000163105 is an apocalyptic number.

It is an amenable number.

21000163105 is a deficient number, since it is larger than the sum of its proper divisors (4512526559).

21000163105 is a wasteful number, since it uses less digits than its factorization.

21000163105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148656.

The product of its (nonzero) digits is 180, while the sum is 19.

Adding to 21000163105 its reverse (50136100012), we get a palindrome (71136263117).

The spelling of 21000163105 in words is "twenty-one billion, one hundred sixty-three thousand, one hundred five".