21164792159 has 4 divisors (see below), whose sum is σ = 24188333904. Its totient is φ = 18141250416.

The previous prime is 21164792111. The next prime is 21164792171. The reversal of 21164792159 is 95129746112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21164792159 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21164792659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1511770862 + ... + 1511770875.

It is an arithmetic number, because the mean of its divisors is an integer number (6047083476).

Almost surely, 2^21164792159 is an apocalyptic number.

21164792159 is a deficient number, since it is larger than the sum of its proper divisors (3023541745).

21164792159 is an equidigital number, since it uses as much as digits as its factorization.

21164792159 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3023541744.

The product of its digits is 272160, while the sum is 47.

The spelling of 21164792159 in words is "twenty-one billion, one hundred sixty-four million, seven hundred ninety-two thousand, one hundred fifty-nine".