21600000239 has 2 divisors, whose sum is σ = 21600000240. Its totient is φ = 21600000238.

The previous prime is 21600000229. The next prime is 21600000307. The reversal of 21600000239 is 93200000612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21600000239 - 2²⁰ = 21598951663 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21600000229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10800000119 + 10800000120.

It is an arithmetic number, because the mean of its divisors is an integer number (10800000120).

Almost surely, 2^21600000239 is an apocalyptic number.

21600000239 is a deficient number, since it is larger than the sum of its proper divisors (1).

21600000239 is an equidigital number, since it uses as much as digits as its factorization.

21600000239 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 23.

The spelling of 21600000239 in words is "twenty-one billion, six hundred million, two hundred thirty-nine", and thus it is an aban number.