20424501521 has 2 divisors, whose sum is σ = 20424501522. Its totient is φ = 20424501520.

The previous prime is 20424501511. The next prime is 20424501541. The reversal of 20424501521 is 12510542402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13508250625 + 6916250896 = 116225^2 + 83164^2 .

It is a cyclic number.

It is not a de Polignac number, because 20424501521 - 2³⁰ = 19350759697 is a prime.

It is not a weakly prime, because it can be changed into another prime (20424501511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10212250760 + 10212250761.

It is an arithmetic number, because the mean of its divisors is an integer number (10212250761).

Almost surely, 2^20424501521 is an apocalyptic number.

It is an amenable number.

20424501521 is a deficient number, since it is larger than the sum of its proper divisors (1).

20424501521 is an equidigital number, since it uses as much as digits as its factorization.

20424501521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3200, while the sum is 26.

The spelling of 20424501521 in words is "twenty billion, four hundred twenty-four million, five hundred one thousand, five hundred twenty-one".