21909233159 has 16 divisors (see below), whose sum is σ = 24419045376. Its totient is φ = 19486096800.

The previous prime is 21909233153. The next prime is 21909233173. The reversal of 21909233159 is 95133290912.

It is a cyclic number.

It is not a de Polignac number, because 21909233159 - 2²⁰ = 21908184583 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21909233153) 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 15 ways as a sum of consecutive naturals, for example, 1630649 + ... + 1644029.

It is an arithmetic number, because the mean of its divisors is an integer number (1526190336).

Almost surely, 2^21909233159 is an apocalyptic number.

21909233159 is a deficient number, since it is larger than the sum of its proper divisors (2509812217).

21909233159 is a wasteful number, since it uses less digits than its factorization.

21909233159 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16606.

The product of its (nonzero) digits is 131220, while the sum is 44.

The spelling of 21909233159 in words is "twenty-one billion, nine hundred nine million, two hundred thirty-three thousand, one hundred fifty-nine".