21673506163 has 8 divisors (see below), whose sum is σ = 22139896320. Its totient is φ = 21207334920.

The previous prime is 21673506157. The next prime is 21673506167. The reversal of 21673506163 is 36160537612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21673506163 - 2²⁵ = 21639951731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21673506167) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153868 + ... + 258886.

It is an arithmetic number, because the mean of its divisors is an integer number (2767487040).

Almost surely, 2^21673506163 is an apocalyptic number.

21673506163 is a deficient number, since it is larger than the sum of its proper divisors (466390157).

21673506163 is a wasteful number, since it uses less digits than its factorization.

21673506163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109457.

The product of its (nonzero) digits is 136080, while the sum is 40.

The spelling of 21673506163 in words is "twenty-one billion, six hundred seventy-three million, five hundred six thousand, one hundred sixty-three".