21152530521289 has 2 divisors, whose sum is σ = 21152530521290. Its totient is φ = 21152530521288.

The previous prime is 21152530521263. The next prime is 21152530521359. The reversal of 21152530521289 is 98212503525112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21144666378889 + 7864142400 = 4598333^2 + 88680^2 .

It is a cyclic number.

It is not a de Polignac number, because 21152530521289 - 2⁵ = 21152530521257 is a prime.

It is not a weakly prime, because it can be changed into another prime (21152530521989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10576265260644 + 10576265260645.

It is an arithmetic number, because the mean of its divisors is an integer number (10576265260645).

Almost surely, 2^{21152530521289} is an apocalyptic number.

It is an amenable number.

21152530521289 is a deficient number, since it is larger than the sum of its proper divisors (1).

21152530521289 is an equidigital number, since it uses as much as digits as its factorization.

21152530521289 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 46.

The spelling of 21152530521289 in words is "twenty-one trillion, one hundred fifty-two billion, five hundred thirty million, five hundred twenty-one thousand, two hundred eighty-nine".