21109000239 has 6 divisors (see below), whose sum is σ = 30490778136. Its totient is φ = 14072666820.

The previous prime is 21109000193. The next prime is 21109000259. The reversal of 21109000239 is 93200090112.

It is not a de Polignac number, because 21109000239 - 2⁹ = 21108999727 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21109000259) 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 5 ways as a sum of consecutive naturals, for example, 1172722227 + ... + 1172722244.

It is an arithmetic number, because the mean of its divisors is an integer number (5081796356).

Almost surely, 2^21109000239 is an apocalyptic number.

21109000239 is a deficient number, since it is larger than the sum of its proper divisors (9381777897).

21109000239 is a wasteful number, since it uses less digits than its factorization.

21109000239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2345444477 (or 2345444474 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The spelling of 21109000239 in words is "twenty-one billion, one hundred nine million, two hundred thirty-nine", and thus it is an aban number.