21508158359 has 2 divisors, whose sum is σ = 21508158360. Its totient is φ = 21508158358.

The previous prime is 21508158223. The next prime is 21508158361. The reversal of 21508158359 is 95385180512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21508158359 - 2¹² = 21508154263 is a prime.

Together with 21508158361, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21508155359) 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 as a sum of consecutive naturals, namely, 10754079179 + 10754079180.

It is an arithmetic number, because the mean of its divisors is an integer number (10754079180).

Almost surely, 2^21508158359 is an apocalyptic number.

21508158359 is a deficient number, since it is larger than the sum of its proper divisors (1).

21508158359 is an equidigital number, since it uses as much as digits as its factorization.

21508158359 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432000, while the sum is 47.

The spelling of 21508158359 in words is "twenty-one billion, five hundred eight million, one hundred fifty-eight thousand, three hundred fifty-nine".