21550450163 has 32 divisors (see below), whose sum is σ = 25735822848. Its totient is φ = 17820864000.

The previous prime is 21550450111. The next prime is 21550450177. The reversal of 21550450163 is 36105405512.

It is a cyclic number.

It is not a de Polignac number, because 21550450163 - 2¹² = 21550446067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21550450183) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1034456 + ... + 1055082.

It is an arithmetic number, because the mean of its divisors is an integer number (804244464).

Almost surely, 2^21550450163 is an apocalyptic number.

21550450163 is a deficient number, since it is larger than the sum of its proper divisors (4185372685).

21550450163 is a wasteful number, since it uses less digits than its factorization.

21550450163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20843.

The product of its (nonzero) digits is 18000, while the sum is 32.

Adding to 21550450163 its reverse (36105405512), we get a palindrome (57655855675).

The spelling of 21550450163 in words is "twenty-one billion, five hundred fifty million, four hundred fifty thousand, one hundred sixty-three".