21830798161 has 4 divisors (see below), whose sum is σ = 21893711472. Its totient is φ = 21767884852.

The previous prime is 21830798153. The next prime is 21830798173. The reversal of 21830798161 is 16189703812.

It is a happy number.

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 21830798161 - 2³ = 21830798153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21830798111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31456135 + ... + 31456828.

It is an arithmetic number, because the mean of its divisors is an integer number (5473427868).

Almost surely, 2^21830798161 is an apocalyptic number.

It is an amenable number.

21830798161 is a deficient number, since it is larger than the sum of its proper divisors (62913311).

21830798161 is an equidigital number, since it uses as much as digits as its factorization.

21830798161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62913310.

The product of its (nonzero) digits is 145152, while the sum is 46.

The spelling of 21830798161 in words is "twenty-one billion, eight hundred thirty million, seven hundred ninety-eight thousand, one hundred sixty-one".