21793118161 has 4 divisors (see below), whose sum is σ = 22940124400. Its totient is φ = 20646111924.

The previous prime is 21793118119. The next prime is 21793118167. The reversal of 21793118161 is 16181139712.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21793118161 - 2¹⁹ = 21792593873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21793118167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 573503091 + ... + 573503128.

It is an arithmetic number, because the mean of its divisors is an integer number (5735031100).

Almost surely, 2^21793118161 is an apocalyptic number.

It is an amenable number.

21793118161 is a deficient number, since it is larger than the sum of its proper divisors (1147006239).

21793118161 is a wasteful number, since it uses less digits than its factorization.

21793118161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1147006238.

The product of its digits is 18144, while the sum is 40.

The spelling of 21793118161 in words is "twenty-one billion, seven hundred ninety-three million, one hundred eighteen thousand, one hundred sixty-one".