21759500839 has 2 divisors, whose sum is σ = 21759500840. Its totient is φ = 21759500838.

The previous prime is 21759500837. The next prime is 21759500899. The reversal of 21759500839 is 93800595712.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21759500839 - 2¹ = 21759500837 is a prime.

Together with 21759500837, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 21759500792 and 21759500801.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21759500837) 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 as a sum of consecutive naturals, namely, 10879750419 + 10879750420.

It is an arithmetic number, because the mean of its divisors is an integer number (10879750420).

Almost surely, 2^21759500839 is an apocalyptic number.

21759500839 is a deficient number, since it is larger than the sum of its proper divisors (1).

21759500839 is an equidigital number, since it uses as much as digits as its factorization.

21759500839 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 680400, while the sum is 49.

The spelling of 21759500839 in words is "twenty-one billion, seven hundred fifty-nine million, five hundred thousand, eight hundred thirty-nine".