21510243205159 has 2 divisors, whose sum is σ = 21510243205160. Its totient is φ = 21510243205158.

The previous prime is 21510243205147. The next prime is 21510243205169. The reversal of 21510243205159 is 95150234201512.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21510243205159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21510243205169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10755121602579 + 10755121602580.

It is an arithmetic number, because the mean of its divisors is an integer number (10755121602580).

Almost surely, 2^{21510243205159} is an apocalyptic number.

21510243205159 is a deficient number, since it is larger than the sum of its proper divisors (1).

21510243205159 is an equidigital number, since it uses as much as digits as its factorization.

21510243205159 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108000, while the sum is 40.

The spelling of 21510243205159 in words is "twenty-one trillion, five hundred ten billion, two hundred forty-three million, two hundred five thousand, one hundred fifty-nine".