21001230163 has 4 divisors (see below), whose sum is σ = 21014633920. Its totient is φ = 20987826408.

The previous prime is 21001230139. The next prime is 21001230227. The reversal of 21001230163 is 36103210012.

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 21001230163 - 2²¹ = 20999133011 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 21001230163.

It is not an unprimeable number, because it can be changed into a prime (21001230463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6699528 + ... + 6702661.

It is an arithmetic number, because the mean of its divisors is an integer number (5253658480).

Almost surely, 2^21001230163 is an apocalyptic number.

21001230163 is a deficient number, since it is larger than the sum of its proper divisors (13403757).

21001230163 is a wasteful number, since it uses less digits than its factorization.

21001230163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13403756.

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

Adding to 21001230163 its reverse (36103210012), we get a palindrome (57104440175).

The spelling of 21001230163 in words is "twenty-one billion, one million, two hundred thirty thousand, one hundred sixty-three".