21816164841 has 8 divisors (see below), whose sum is σ = 29111854464. Its totient is φ = 14532292560.

The previous prime is 21816164833. The next prime is 21816164873. The reversal of 21816164841 is 14846161812.

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

It is not a de Polignac number, because 21816164841 - 2³ = 21816164833 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21816164793 and 21816164802.

It is not an unprimeable number, because it can be changed into a prime (21816164891) 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, 2950026 + ... + 2957411.

It is an arithmetic number, because the mean of its divisors is an integer number (3638981808).

Almost surely, 2^21816164841 is an apocalyptic number.

It is an amenable number.

21816164841 is a deficient number, since it is larger than the sum of its proper divisors (7295689623).

21816164841 is a wasteful number, since it uses less digits than its factorization.

21816164841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5908671.

The product of its digits is 73728, while the sum is 42.

The spelling of 21816164841 in words is "twenty-one billion, eight hundred sixteen million, one hundred sixty-four thousand, eight hundred forty-one".