21066529459 has 2 divisors, whose sum is σ = 21066529460. Its totient is φ = 21066529458.

The previous prime is 21066529417. The next prime is 21066529487. The reversal of 21066529459 is 95492566012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21066529459 - 2¹⁷ = 21066398387 is a prime.

It is not a weakly prime, because it can be changed into another prime (21066529499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10533264729 + 10533264730.

It is an arithmetic number, because the mean of its divisors is an integer number (10533264730).

Almost surely, 2^21066529459 is an apocalyptic number.

21066529459 is a deficient number, since it is larger than the sum of its proper divisors (1).

21066529459 is an equidigital number, since it uses as much as digits as its factorization.

21066529459 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1166400, while the sum is 49.

The spelling of 21066529459 in words is "twenty-one billion, sixty-six million, five hundred twenty-nine thousand, four hundred fifty-nine".