21510082459 has 2 divisors, whose sum is σ = 21510082460. Its totient is φ = 21510082458.

The previous prime is 21510082453. The next prime is 21510082523. The reversal of 21510082459 is 95428001512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21510082459 - 2⁷ = 21510082331 is a prime.

It is not a weakly prime, because it can be changed into another prime (21510082453) 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, 10755041229 + 10755041230.

It is an arithmetic number, because the mean of its divisors is an integer number (10755041230).

Almost surely, 2^21510082459 is an apocalyptic number.

21510082459 is a deficient number, since it is larger than the sum of its proper divisors (1).

21510082459 is an equidigital number, since it uses as much as digits as its factorization.

21510082459 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28800, while the sum is 37.

The spelling of 21510082459 in words is "twenty-one billion, five hundred ten million, eighty-two thousand, four hundred fifty-nine".