21240827527 has 2 divisors, whose sum is σ = 21240827528. Its totient is φ = 21240827526.

The previous prime is 21240827513. The next prime is 21240827563. The reversal of 21240827527 is 72572804212.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21240827527 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21240827527.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21340827527) 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, 10620413763 + 10620413764.

It is an arithmetic number, because the mean of its divisors is an integer number (10620413764).

Almost surely, 2^21240827527 is an apocalyptic number.

21240827527 is a deficient number, since it is larger than the sum of its proper divisors (1).

21240827527 is an equidigital number, since it uses as much as digits as its factorization.

21240827527 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 125440, while the sum is 40.

The spelling of 21240827527 in words is "twenty-one billion, two hundred forty million, eight hundred twenty-seven thousand, five hundred twenty-seven".