21001302163 has 4 divisors (see below), whose sum is σ = 21008261560. Its totient is φ = 20994342768.

The previous prime is 21001302109. The next prime is 21001302169. The reversal of 21001302163 is 36120310012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21001302163 - 2¹⁷ = 21001171091 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21001302163.

It is not an unprimeable number, because it can be changed into a prime (21001302169) 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 3 ways as a sum of consecutive naturals, for example, 3475170 + ... + 3481207.

It is an arithmetic number, because the mean of its divisors is an integer number (5252065390).

Almost surely, 2^21001302163 is an apocalyptic number.

21001302163 is a deficient number, since it is larger than the sum of its proper divisors (6959397).

21001302163 is an equidigital number, since it uses as much as digits as its factorization.

21001302163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6959396.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21001302163 its reverse (36120310012), we get a palindrome (57121612175).

The spelling of 21001302163 in words is "twenty-one billion, one million, three hundred two thousand, one hundred sixty-three".